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    STRICKLAND v. WASHINGTON, 466 U.S. 668 (1984)

    U.S. Supreme Court

    STRICKLAND v. WASHINGTON, 466 U.S. 668 (1984)

    466 U.S. 668

    STRICKLAND, SUPERINTENDENT, FLORIDA STATE PRISON, ET AL. v. WASHINGTON
    CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE ELEVENTH CIRCUIT

    No. 82-1554.

    Argued January 10, 1984
    Decided May 14, 1984

    Respondent pleaded guilty in a Florida trial court to an indictment that included three capital murder charges. In the plea colloquy, respondent told the trial judge that, although he had committed a string of burglaries, he had no significant prior criminal record and that at the time of his criminal spree he was under extreme stress caused by his inability to support his family. The trial judge told respondent that he had "a great deal of respect for people who are willing to step forward and admit their responsibility." In preparing for the sentencing hearing, defense counsel spoke with respondent about his background, but did not seek out character witnesses or request a psychiatric examination. Counsel's decision not to present evidence concerning respondent's character and emotional state reflected his judgment that it was advisable to rely on the plea colloquy for evidence as to such matters, thus preventing the State from cross-examining respondent and from presenting psychiatric evidence of its own. Counsel did not request a presentence report because it would have included respondent's criminal history and thereby would have undermined the claim of no significant prior criminal record. Finding numerous aggravating circumstances and no mitigating circumstance, the trial judge sentenced respondent to death on each of the murder counts. The Florida Supreme Court affirmed, and respondent then sought collateral relief in state court on the ground, inter alia, that counsel had rendered ineffective assistance at the sentencing proceeding in several respects, including his failure to request a psychiatric report, to investigate and present character witnesses, and to seek a presentence report. The trial court denied relief, and the Florida Supreme Court affirmed. Respondent then filed a habeas corpus petition in Federal District Court advancing numerous grounds for relief, including the claim of ineffective assistance of counsel. After an evidentiary hearing, the District Court denied relief, concluding that although counsel made errors in judgment in failing to investigate mitigating evidence further than he did, no prejudice to respondent's sentence resulted from any such error in judgment. The Court of Appeals ultimately reversed, stating that the Sixth Amendment accorded [466 U.S. 668, 669]   criminal defendants a right to counsel rendering "reasonably effective assistance given the totality of the circumstances." After outlining standards for judging whether a defense counsel fulfilled the duty to investigate nonstatutory mitigating circumstances and whether counsel's errors were sufficiently prejudicial to justify reversal, the Court of Appeals remanded the case for application of the standards.

    Held:

    693 F.2d 1243, reversed.

    O'CONNOR, J., delivered the opinion of the Court, in which BURGER, C. J., and WHITE, BLACKMUN, POWELL, REHNQUIST, and STEVENS, JJ., joined. BRENNAN, J., filed an opinion concurring in part and dissenting in part, post, p. 701. MARSHALL, J., filed a dissenting opinion, post, p. 706.

    Carolyn M. Snurkowski, Assistant Attorney General of Florida, argued the cause for petitioners. On the briefs were Jim Smith, Attorney General, and Calvin L. Fox, Assistant Attorney General.

    Richard E. Shapiro argued the cause for respondent. With him on the brief was Joseph H. Rodriguez. *  

    [ Footnote * ] Briefs of amici curiae urging reversal were filed for the United States by Solicitor General Lee, Assistant Attorney General Trott, Deputy Solicitor General Frey, and Edwin S. Kneedler; for the State of Alabama et al. by Mike Greely, Attorney General of Montana, and John H. Maynard, Assistant Attorney General, Charles A. Graddick, Attorney General of Alabama, Robert K. Corbin, Attorney General of Arizona, John Steven Clark, Attorney General of Arkansas, John Van de Kamp, Attorney General of California, Duane Woodard, Attorney General of Colorado, Austin [466 U.S. 668, 671]   J. McGuigan, Chief State's Attorney of Connecticut, Michael J. Bowers, Attorney General of Georgia, Tany S. Hong, Attorney General of Hawaii, Jim Jones, Attorney General of Idaho, Linley E. Pearson, Attorney General of Indiana, Robert T. Stephan, Attorney General of Kansas, Steven L. Beshear, Attorney General of Kentucky, William J. Guste, Jr., Attorney General of Louisiana, James E. Tierney, Attorney General of Maine, Stephen H. Sachs, Attorney General of Maryland, Francis X. Bellotti, Attorney General of Massachusetts, Frank J. Kelley, Attorney General of Michigan, Hubert H. Humphrey III, Attorney General of Minnesota, William A. Allain, Attorney General of Mississippi, John D. Ashcroft, Attorney General of Missouri, Paul L. Douglas, Attorney General of Nebraska, Brian McKay, Attorney General of Nevada, Irwin I. Kimmelman, Attorney General of New Jersey, Paul Bardacke, Attorney General of New Mexico, Rufus L. Edmisten, Attorney General of North Carolina, Robert Wefald, Attorney General of North Dakota, Anthony Celebrezze, Jr., Attorney General of Ohio, Michael Turpen, Attorney General of Oklahoma, Dave Frohnmayer, Attorney General of Oregon, LeRoy S. Zimmerman, Attorney General of Pennsylvania, Dennis J. Roberts II, Attorney General of Rhode Island, T. Travis Medlock, Attorney General of South Carolina, Mark V. Meierhenry, Attorney General of South Dakota, William M. Leech, Jr., Attorney General of Tennessee, David L. Wilkinson, Attorney General of Utah, John J. Easton, Attorney General of Vermont, Gerald L. Baliles, Attorney General of Virginia, Kenneth O. Eikenberry, Attorney General of Washington, Chauncey H. Browning, Attorney General of West Virginia, and Archie G. McClintock, Attorney General of Wyoming; and for the Washington Legal Foundation by Daniel J. Popeo, Paul D. Kamenar, and Nicholas E. Calio.

    Richard J. Wilson, Charles S. Sims, and Burt Neuborne filed a brief for the National Legal Aid and Defender Association et al. as amici curiae urging affirmance. [466 U.S. 668, 671]  

    JUSTICE O'CONNOR delivered the opinion of the Court.

    This case requires us to consider the proper standards for judging a criminal defendant's contention that the Constitution requires a conviction or death sentence to be set aside because counsel's assistance at the trial or sentencing was ineffective.

    I

    A

    During a 10-day period in September 1976, respondent planned and committed three groups of crimes, which included [466 U.S. 668, 672]   three brutal stabbing murders, torture, kidnaping, severe assaults, attempted murders, attempted extortion, and theft. After his two accomplices were arrested, respondent surrendered to police and voluntarily gave a lengthy statement confessing to the third of the criminal episodes. The State of Florida indicted respondent for kidnaping and murder and appointed an experienced criminal lawyer to represent him.

    Counsel actively pursued pretrial motions and discovery. He cut his efforts short, however, and he experienced a sense of hopelessness about the case, when he learned that, against his specific advice, respondent had also confessed to the first two murders. By the date set for trial, respondent was subject to indictment for three counts of first-degree murder and multiple counts of robbery, kidnaping for ransom, breaking and entering and assault, attempted murder, and conspiracy to commit robbery. Respondent waived his right to a jury trial, again acting against counsel's advice, and pleaded guilty to all charges, including the three capital murder charges.

    In the plea colloquy, respondent told the trial judge that, although he had committed a string of burglaries, he had no significant prior criminal record and that at the time of his criminal spree he was under extreme stress caused by his inability to support his family. App. 50-53. He also stated, however, that he accepted responsibility for the crimes. E. g., id., at 54, 57. The trial judge told respondent that he had "a great deal of respect for people who are willing to step forward and admit their responsibility" but that he was making no statement at all about his likely sentencing decision. Id., at 62.

    Counsel advised respondent to invoke his right under Florida law to an advisory jury at his capital sentencing hearing. Respondent rejected the advice and waived the right. He chose instead to be sentenced by the trial judge without a jury recommendation.

    In preparing for the sentencing hearing, counsel spoke with respondent about his background. He also spoke on [466 U.S. 668, 673]   the telephone with respondent's wife and mother, though he did not follow up on the one unsuccessful effort to meet with them. He did not otherwise seek out character witnesses for respondent. App. to Pet. for Cert. A265. Nor did he request a psychiatric examination, since his conversations with his client gave no indication that respondent had psychological problems. Id., at A266.

    Counsel decided not to present and hence not to look further for evidence concerning respondent's character and emotional state. That decision reflected trial counsel's sense of hopelessness about overcoming the evidentiary effect of respondent's confessions to the gruesome crimes. See id., at A282. It also reflected the judgment that it was advisable to rely on the plea colloquy for evidence about respondent's background and about his claim of emotional stress: the plea colloquy communicated sufficient information about these subjects, and by forgoing the opportunity to present new evidence on these subjects, counsel prevented the State from cross-examining respondent on his claim and from putting on psychiatric evidence of its own. Id., at A223-A225.

    Counsel also excluded from the sentencing hearing other evidence he thought was potentially damaging. He successfully moved to exclude respondent's "rap sheet." Id., at A227; App. 311. Because he judged that a presentence report might prove more detrimental than helpful, as it would have included respondent's criminal history and thereby would have undermined the claim of no significant history of criminal activity, he did not request that one be prepared. App. to Pet. for Cert. A227-A228, A265-A266.

    At the sentencing hearing, counsel's strategy was based primarily on the trial judge's remarks at the plea colloquy as well as on his reputation as a sentencing judge who thought it important for a convicted defendant to own up to his crime. Counsel argued that respondent's remorse and acceptance of responsibility justified sparing him from the death penalty. Id., at A265-A266. Counsel also argued that respondent had no history of criminal activity and that respondent committed [466 U.S. 668, 674]   the crimes under extreme mental or emotional disturbance, thus coming within the statutory list of mitigating circumstances. He further argued that respondent should be spared death because he had surrendered, confessed, and offered to testify against a codefendant and because respondent was fundamentally a good person who had briefly gone badly wrong in extremely stressful circumstances. The State put on evidence and witnesses largely for the purpose of describing the details of the crimes. Counsel did not cross-examine the medical experts who testified about the manner of death of respondent's victims.

    The trial judge found several aggravating circumstances with respect to each of the three murders. He found that all three murders were especially heinous, atrocious, and cruel, all involving repeated stabbings. All three murders were committed in the course of at least one other dangerous and violent felony, and since all involved robbery, the murders were for pecuniary gain. All three murders were committed to avoid arrest for the accompanying crimes and to hinder law enforcement. In the course of one of the murders, respondent knowingly subjected numerous persons to a grave risk of death by deliberately stabbing and shooting the murder victim's sisters-in-law, who sustained severe - in one case, ultimately fatal - injuries.

    With respect to mitigating circumstances, the trial judge made the same findings for all three capital murders. First, although there was no admitted evidence of prior convictions, respondent had stated that he had engaged in a course of stealing. In any case, even if respondent had no significant history of criminal activity, the aggravating circumstances "would still clearly far outweigh" that mitigating factor. Second, the judge found that, during all three crimes, respondent was not suffering from extreme mental or emotional disturbance and could appreciate the criminality of his acts. Third, none of the victims was a participant in, or consented to, respondent's conduct. Fourth, respondent's [466 U.S. 668, 675]   participation in the crimes was neither minor nor the result of duress or domination by an accomplice. Finally, respondent's age (26) could not be considered a factor in mitigation, especially when viewed in light of respondent's planning of the crimes and disposition of the proceeds of the various accompanying thefts.

    In short, the trial judge found numerous aggravating circumstances and no (or a single comparatively insignificant) mitigating circumstance. With respect to each of the three convictions for capital murder, the trial judge concluded: "A careful consideration of all matters presented to the court impels the conclusion that there are insufficient mitigating circumstances . . . to outweigh the aggravating circumstances." See Washington v. State, 362 So.2d 658, 663-664 (Fla. 1978) (quoting trial court findings), cert. denied, 441 U.S. 937 (1979). He therefore sentenced respondent to death on each of the three counts of murder and to prison terms for the other crimes. The Florida Supreme Court upheld the convictions and sentences on direct appeal.

    B

    Respondent subsequently sought collateral relief in state court on numerous grounds, among them that counsel had rendered ineffective assistance at the sentencing proceeding. Respondent challenged counsel's assistance in six respects. He asserted that counsel was ineffective because he failed to move for a continuance to prepare for sentencing, to request a psychiatric report, to investigate and present character witnesses, to seek a presentence investigation report, to present meaningful arguments to the sentencing judge, and to investigate the medical examiner's reports or cross-examine the medical experts. In support of the claim, respondent submitted 14 affidavits from friends, neighbors, and relatives stating that they would have testified if asked to do so. He also submitted one psychiatric report and one psychological report stating that respondent, though not under the influence [466 U.S. 668, 676]   of extreme mental or emotional disturbance, was "chronically frustrated and depressed because of his economic dilemma" at the time of his crimes. App. 7; see also id., at 14.

    The trial court denied relief without an evidentiary hearing, finding that the record evidence conclusively showed that the ineffectiveness claim was meritless. App. to Pet. for Cert. A206-A243. Four of the assertedly prejudicial errors required little discussion. First, there were no grounds to request a continuance, so there was no error in not requesting one when respondent pleaded guilty. Id., at A218-A220. Second, failure to request a presentence investigation was not a serious error because the trial judge had discretion not to grant such a request and because any presentence investigation would have resulted in admission of respondent's "rap sheet" and thus would have undermined his assertion of no significant history of criminal activity. Id., at A226-A228. Third, the argument and memorandum given to the sentencing judge were "admirable" in light of the overwhelming aggravating circumstances and absence of mitigating circumstances. Id., at A228. Fourth, there was no error in failure to examine the medical examiner's reports or to cross-examine the medical witnesses testifying on the manner of death of respondent's victims, since respondent admitted that the victims died in the ways shown by the unchallenged medical evidence. Id., at A229.

    The trial court dealt at greater length with the two other bases for the ineffectiveness claim. The court pointed out that a psychiatric examination of respondent was conducted by state order soon after respondent's initial arraignment. That report states that there was no indication of major mental illness at the time of the crimes. Moreover, both the reports submitted in the collateral proceeding state that, although respondent was "chronically frustrated and depressed because of his economic dilemma," he was not under the influence of extreme mental or emotional disturbance. All three [466 U.S. 668, 677]   reports thus directly undermine the contention made at the sentencing hearing that respondent was suffering from extreme mental or emotional disturbance during his crime spree. Accordingly, counsel could reasonably decide not to seek psychiatric reports; indeed, by relying solely on the plea colloquy to support the emotional disturbance contention, counsel denied the State an opportunity to rebut his claim with psychiatric testimony. In any event, the aggravating circumstances were so overwhelming that no substantial prejudice resulted from the absence at sentencing of the psychiatric evidence offered in the collateral attack.

    The court rejected the challenge to counsel's failure to develop and to present character evidence for much the same reasons. The affidavits submitted in the collateral proceeding showed nothing more than that certain persons would have testified that respondent was basically a good person who was worried about his family's financial problems. Respondent himself had already testified along those lines at the plea colloquy. Moreover, respondent's admission of a course of stealing rebutted many of the factual allegations in the affidavits. For those reasons, and because the sentencing judge had stated that the death sentence would be appropriate even if respondent had no significant prior criminal history, no substantial prejudice resulted from the absence at sentencing of the character evidence offered in the collateral attack.

    Applying the standard for ineffectiveness claims articulated by the Florida Supreme Court in Knight v. State, 394 So.2d 997 (1981), the trial court concluded that respondent had not shown that counsel's assistance reflected any substantial and serious deficiency measurably below that of competent counsel that was likely to have affected the outcome of the sentencing proceeding. The court specifically found: "[A]s a matter of law, the record affirmatively demonstrates beyond any doubt that even if [counsel] had done each of the . . . things [that respondent alleged counsel had failed to do] [466 U.S. 668, 678]   at the time of sentencing, there is not even the remotest chance that the outcome would have been any different. The plain fact is that the aggravating circumstances proved in this case were completely overwhelming . . . ." App. to Pet. for Cert. A230.

    The Florida Supreme Court affirmed the denial of relief. Washington v. State, 397 So.2d 285 (1981). For essentially the reasons given by the trial court, the State Supreme Court concluded that respondent had failed to make out a prima facie case of either "substantial deficiency or possible prejudice" and, indeed, had "failed to such a degree that we believe, to the point of a moral certainty, that he is entitled to no relief . . . ." Id., at 287. Respondent's claims were "shown conclusively to be without merit so as to obviate the need for an evidentiary hearing." Id., at 286.

    C

    Respondent next filed a petition for a writ of habeas corpus in the United States District Court for the Southern District of Florida. He advanced numerous grounds for relief, among them ineffective assistance of counsel based on the same errors, except for the failure to move for a continuance, as those he had identified in state court. The District Court held an evidentiary hearing to inquire into trial counsel's efforts to investigate and to present mitigating circumstances. Respondent offered the affidavits and reports he had submitted in the state collateral proceedings; he also called his trial counsel to testify. The State of Florida, over respondent's objection, called the trial judge to testify.

    The District Court disputed none of the state court factual findings concerning trial counsel's assistance and made findings of its own that are consistent with the state court findings. The account of trial counsel's actions and decisions given above reflects the combined findings. On the legal issue of ineffectiveness, the District Court concluded that, although trial counsel made errors in judgment in failing to [466 U.S. 668, 679]   investigate nonstatutory mitigating evidence further than he did, no prejudice to respondent's sentence resulted from any such error in judgment. Relying in part on the trial judge's testimony but also on the same factors that led the state courts to find no prejudice, the District Court concluded that "there does not appear to be a likelihood, or even a significant possibility," that any errors of trial counsel had affected the outcome of the sentencing proceeding. App. to Pet. for Cert. A285-A286. The District Court went on to reject all of respondent's other grounds for relief, including one not exhausted in state court, which the District Court considered because, among other reasons, the State urged its consideration. Id., at A286-A292. The court accordingly denied the petition for a writ of habeas corpus.

    On appeal, a panel of the United States Court of Appeals for the Fifth Circuit affirmed in part, vacated in part, and remanded with instructions to apply to the particular facts the framework for analyzing ineffectiveness claims that it developed in its opinion. 673 F.2d 879 (1982). The panel decision was itself vacated when Unit B of the former Fifth Circuit, now the Eleventh Circuit, decided to rehear the case en banc. 679 F.2d 23 (1982). The full Court of Appeals developed its own framework for analyzing ineffective assistance claims and reversed the judgment of the District Court and remanded the case for new factfinding under the newly announced standards. 693 F.2d 1243 (1982).

    The court noted at the outset that, because respondent had raised an unexhausted claim at his evidentiary hearing in the District Court, the habeas petition might be characterized as a mixed petition subject to the rule of Rose v. Lundy, 455 U.S. 509 (1982), requiring dismissal of the entire petition. The court held, however, that the exhaustion requirement is "a matter of comity rather than a matter of jurisdiction" and hence admitted of exceptions. The court agreed with the District Court that this case came within an exception to the mixed petition rule. 693 F.2d, at 1248, n. 7. [466 U.S. 668, 680]  

    Turning to the merits, the Court of Appeals stated that the Sixth Amendment right to assistance of counsel accorded criminal defendants a right to "counsel reasonably likely to render and rendering reasonably effective assistance given the totality of the circumstances." Id., at 1250. The court remarked in passing that no special standard applies in capital cases such as the one before it: the punishment that a defendant faces is merely one of the circumstances to be considered in determining whether counsel was reasonably effective. Id., at 1250, n. 12. The court then addressed respondent's contention that his trial counsel's assistance was not reasonably effective because counsel breached his duty to investigate nonstatutory mitigating circumstances.

    The court agreed that the Sixth Amendment imposes on counsel a duty to investigate, because reasonably effective assistance must be based on professional decisions and informed legal choices can be made only after investigation of options. The court observed that counsel's investigatory decisions must be assessed in light of the information known at the time of the decisions, not in hindsight, and that "[t]he amount of pretrial investigation that is reasonable defies precise measurement." Id., at 1251. Nevertheless, putting guilty-plea cases to one side, the court attempted to classify cases presenting issues concerning the scope of the duty to investigate before proceeding to trial.

    If there is only one plausible line of defense, the court concluded, counsel must conduct a "reasonably substantial investigation" into that line of defense, since there can be no strategic choice that renders such an investigation unnecessary. Id., at 1252. The same duty exists if counsel relies at trial on only one line of defense, although others are available. In either case, the investigation need not be exhaustive. It must include "`an independent examination of the facts, circumstances, pleadings and laws involved.'" Id., at 1253 (quoting Rummel v. Estelle, 590 F.2d 103, 104 (CA5 1979)). The scope of the duty, however, depends [466 U.S. 668, 681]   on such facts as the strength of the government's case and the likelihood that pursuing certain leads may prove more harmful than helpful. 693 F.2d, at 1253, n. 16.

    If there is more than one plausible line of defense, the court held, counsel should ideally investigate each line substantially before making a strategic choice about which lines to rely on at trial. If counsel conducts such substantial investigations, the strategic choices made as a result "will seldom if ever" be found wanting. Because advocacy is an art and not a science, and because the adversary system requires deference to counsel's informed decisions, strategic choices must be respected in these circumstances if they are based on professional judgment. Id., at 1254.

    If counsel does not conduct a substantial investigation into each of several plausible lines of defense, assistance may nonetheless be effective. Counsel may not exclude certain lines of defense for other than strategic reasons. Id., at 1257-1258. Limitations of time and money, however, may force early strategic choices, often based solely on conversations with the defendant and a review of the prosecution's evidence. Those strategic choices about which lines of defense to pursue are owed deference commensurate with the reasonableness of the professional judgments on which they are based. Thus, "when counsel's assumptions are reasonable given the totality of the circumstances and when counsel's strategy represents a reasonable choice based upon those assumptions, counsel need not investigate lines of defense that he has chosen not to employ at trial." Id., at 1255 (footnote omitted). Among the factors relevant to deciding whether particular strategic choices are reasonable are the experience of the attorney, the inconsistency of unpursued and pursued lines of defense, and the potential for prejudice from taking an unpursued line of defense. Id., at 1256-1257, n. 23.

    Having outlined the standards for judging whether defense counsel fulfilled the duty to investigate, the Court of Appeals turned its attention to the question of the prejudice to the [466 U.S. 668, 682]   defense that must be shown before counsel's errors justify reversal of the judgment. The court observed that only in cases of outright denial of counsel, of affirmative government interference in the representation process, or of inherently prejudicial conflicts of interest had this Court said that no special showing of prejudice need be made. Id., at 1258-1259. For cases of deficient performance by counsel, where the government is not directly responsible for the deficiencies and where evidence of deficiency may be more accessible to the defendant than to the prosecution, the defendant must show that counsel's errors "resulted in actual and substantial disadvantage to the course of his defense." Id., at 1262. This standard, the Court of Appeals reasoned, is compatible with the "cause and prejudice" standard for overcoming procedural defaults in federal collateral proceedings and discourages insubstantial claims by requiring more than a showing, which could virtually always be made, of some conceivable adverse effect on the defense from counsel's errors. The specified showing of prejudice would result in reversal of the judgment, the court concluded, unless the prosecution showed that the constitutionally deficient performance was, in light of all the evidence, harmless beyond a reasonable doubt. Id., at 1260-1262.

    The Court of Appeals thus laid down the tests to be applied in the Eleventh Circuit in challenges to convictions on the ground of ineffectiveness of counsel. Although some of the judges of the court proposed different approaches to judging ineffectiveness claims either generally or when raised in federal habeas petitions from state prisoners, id., at 1264-1280 (opinion of Tjoflat, J.); id., at 1280 (opinion of Clark, J.); id., at 1285-1288 (opinion of Roney, J., joined by Fay and Hill, JJ.); id., at 1288-1291 (opinion of Hill, J.), and although some believed that no remand was necessary in this case, id., at 1281-1285 (opinion of Johnson, J., joined by Anderson, J.); id., at 1285-1288 (opinion of Roney, J., joined by Fay and Hill, JJ.); id., at 1288-1291 (opinion of Hill, J.), a majority [466 U.S. 668, 683]   of the judges of the en banc court agreed that the case should be remanded for application of the newly announced standards. Summarily rejecting respondent's claims other than ineffectiveness of counsel, the court accordingly reversed the judgment of the District Court and remanded the case. On remand, the court finally ruled, the state trial judge's testimony, though admissible "to the extent that it contains personal knowledge of historical facts or expert opinion," was not to be considered admitted into evidence to explain the judge's mental processes in reaching his sentencing decision. Id., at 1262-1263; see Fayerweather v. Ritch, 195 U.S. 276, 306 -307 (1904).

    D

    Petitioners, who are officials of the State of Florida, filed a petition for a writ of certiorari seeking review of the decision of the Court of Appeals. The petition presents a type of Sixth Amendment claim that this Court has not previously considered in any generality. The Court has considered Sixth Amendment claims based on actual or constructive denial of the assistance of counsel altogether, as well as claims based on state interference with the ability of counsel to render effective assistance to the accused. E. g., United States v. Cronic, ante, p. 648. With the exception of Cuyler v. Sullivan, 446 U.S. 335 (1980), however, which involved a claim that counsel's assistance was rendered ineffective by a conflict of interest, the Court has never directly and fully addressed a claim of "actual ineffectiveness" of counsel's assistance in a case going to trial. Cf. United States v. Agurs, 427 U.S. 97, 102 , n. 5 (1976).

    In assessing attorney performance, all the Federal Courts of Appeals and all but a few state courts have now adopted the "reasonably effective assistance" standard in one formulation or another. See Trapnell v. United States, 725 F.2d 149, 151-152 (CA2 1983); App. B to Brief for United States in United States v. Cronic, O. T. 1983, No. 82-660, pp. 3a-6a; Sarno, [466 U.S. 668, 684]   Modern Status of Rules and Standards in State Courts as to Adequacy of Defense Counsel's Representation of Criminal Client, 2 A. L. R. 4th 99-157, 7-10 (1980). Yet this Court has not had occasion squarely to decide whether that is the proper standard. With respect to the prejudice that a defendant must show from deficient attorney performance, the lower courts have adopted tests that purport to differ in more than formulation. See App. C to Brief for United States in United States v. Cronic, supra, at 7a-10a; Sarno, supra, at 83-99, 6. In particular, the Court of Appeals in this case expressly rejected the prejudice standard articulated by Judge Leventhal in his plurality opinion in United States v. Decoster, 199 U.S. App. D.C. 359, 371, 374-375, 624 F.2d 196, 208, 211-212 (en banc), cert. denied, 444 U.S. 944 (1979), and adopted by the State of Florida in Knight v. State, 394 So.2d, at 1001, a standard that requires a showing that specified deficient conduct of counsel was likely to have affected the outcome of the proceeding. 693 F.2d, at 1261-1262.

    For these reasons, we granted certiorari to consider the standards by which to judge a contention that the Constitution requires that a criminal judgment be overturned because of the actual ineffective assistance of counsel. 462 U.S. 1105 (1983). We agree with the Court of Appeals that the exhaustion rule requiring dismissal of mixed petitions, though to be strictly enforced, is not jurisdictional. See Rose v. Lundy, 455 U.S., at 515 -520. We therefore address the merits of the constitutional issue.

    II

    In a long line of cases that includes Powell v. Alabama, 287 U.S. 45 (1932), Johnson v. Zerbst, 304 U.S. 458 (1938), and Gideon v. Wainwright, 372 U.S. 335 (1963), this Court has recognized that the Sixth Amendment right to counsel exists, and is needed, in order to protect the fundamental right to a fair trial. The Constitution guarantees a fair trial through [466 U.S. 668, 685]   the Due Process Clauses, but it defines the basic elements of a fair trial largely through the several provisions of the Sixth Amendment, including the Counsel Clause:

    Thus, a fair trial is one in which evidence subject to adversarial testing is presented to an impartial tribunal for resolution of issues defined in advance of the proceeding. The right to counsel plays a crucial role in the adversarial system embodied in the Sixth Amendment, since access to counsel's skill and knowledge is necessary to accord defendants the "ample opportunity to meet the case of the prosecution" to which they are entitled. Adams v. United States ex rel. McCann, 317 U.S. 269, 275 , 276 (1942); see Powell v. Alabama, supra, at 68-69.

    Because of the vital importance of counsel's assistance, this Court has held that, with certain exceptions, a person accused of a federal or state crime has the right to have counsel appointed if retained counsel cannot be obtained. See Argersinger v. Hamlin, 407 U.S. 25 (1972); Gideon v. Wainwright, supra; Johnson v. Zerbst, supra. That a person who happens to be a lawyer is present at trial alongside the accused, however, is not enough to satisfy the constitutional command. The Sixth Amendment recognizes the right to the assistance of counsel because it envisions counsel's playing a role that is critical to the ability of the adversarial system to produce just results. An accused is entitled to be assisted by an attorney, whether retained or appointed, who plays the role necessary to ensure that the trial is fair. [466 U.S. 668, 686]  

    For that reason, the Court has recognized that "the right to counsel is the right to the effective assistance of counsel." McMann v. Richardson, 397 U.S. 759, 771 , n. 14 (1970). Government violates the right to effective assistance when it interferes in certain ways with the ability of counsel to make independent decisions about how to conduct the defense. See, e. g., Geders v. United States, 425 U.S. 80 (1976) (bar on attorney-client consultation during overnight recess); Herring v. New York, 422 U.S. 853 (1975) (bar on summation at bench trial); Brooks v. Tennessee, 406 U.S. 605, 612 -613 (1972) (requirement that defendant be first defense witness); Ferguson v. Georgia, 365 U.S. 570, 593 -596 (1961) (bar on direct examination of defendant). Counsel, however, can also deprive a defendant of the right to effective assistance, simply by failing to render "adequate legal assistance," Cuyler v. Sullivan, 446 U.S., at 344 . Id., at 345-350 (actual conflict of interest adversely affecting lawyer's performance renders assistance ineffective).

    The Court has not elaborated on the meaning of the constitutional requirement of effective assistance in the latter class of cases - that is, those presenting claims of "actual ineffectiveness." In giving meaning to the requirement, however, we must take its purpose - to ensure a fair trial - as the guide. The benchmark for judging any claim of ineffectiveness must be whether counsel's conduct so undermined the proper functioning of the adversarial process that the trial cannot be relied on as having produced a just result.

    The same principle applies to a capital sentencing proceeding such as that provided by Florida law. We need not consider the role of counsel in an ordinary sentencing, which may involve informal proceedings and standardless discretion in the sentencer, and hence may require a different approach to the definition of constitutionally effective assistance. A capital sentencing proceeding like the one involved in this case, however, is sufficiently like a trial in its adversarial format and in the existence of standards for decision, see Barclay [466 U.S. 668, 687]   v. Florida, 463 U.S. 939, 952 -954 (1983); Bullington v. Missouri, 451 U.S. 430 (1981), that counsel's role in the proceeding is comparable to counsel's role at trial - to ensure that the adversarial testing process works to produce a just result under the standards governing decision. For purposes of describing counsel's duties, therefore, Florida's capital sentencing proceeding need not be distinguished from an ordinary trial.

    III

    A convicted defendant's claim that counsel's assistance was so defective as to require reversal of a conviction or death sentence has two components. First, the defendant must show that counsel's performance was deficient. This requires showing that counsel made errors so serious that counsel was not functioning as the "counsel" guaranteed the defendant by the Sixth Amendment. Second, the defendant must show that the deficient performance prejudiced the defense. This requires showing that counsel's errors were so serious as to deprive the defendant of a fair trial, a trial whose result is reliable. Unless a defendant makes both showings, it cannot be said that the conviction or death sentence resulted from a breakdown in the adversary process that renders the result unreliable.

    A

    As all the Federal Courts of Appeals have now held, the proper standard for attorney performance is that of reasonably effective assistance. See Trapnell v. United States, 725 F.2d, at 151-152. The Court indirectly recognized as much when it stated in McMann v. Richardson, supra, at 770, 771, that a guilty plea cannot be attacked as based on inadequate legal advice unless counsel was not "a reasonably competent attorney" and the advice was not "within the range of competence demanded of attorneys in criminal cases." See also Cuyler v. Sullivan, supra, at 344. When a convicted defendant [466 U.S. 668, 688]   complains of the ineffectiveness of counsel's assistance, the defendant must show that counsel's representation fell below an objective standard of reasonableness.

    More specific guidelines are not appropriate. The Sixth Amendment refers simply to "counsel," not specifying particular requirements of effective assistance. It relies instead on the legal profession's maintenance of standards sufficient to justify the law's presumption that counsel will fulfill the role in the adversary process that the Amendment envisions. See Michel v. Louisiana, 350 U.S. 91, 100 -101 (1955). The proper measure of attorney performance remains simply reasonableness under prevailing professional norms.

    Representation of a criminal defendant entails certain basic duties. Counsel's function is to assist the defendant, and hence counsel owes the client a duty of loyalty, a duty to avoid conflicts of interest. See Cuyler v. Sullivan, supra, at 346. From counsel's function as assistant to the defendant derive the overarching duty to advocate the defendant's cause and the more particular duties to consult with the defendant on important decisions and to keep the defendant informed of important developments in the course of the prosecution. Counsel also has a duty to bring to bear such skill and knowledge as will render the trial a reliable adversarial testing process. See Powell v. Alabama, 287 U.S., at 68 -69.

    These basic duties neither exhaustively define the obligations of counsel nor form a checklist for judicial evaluation of attorney performance. In any case presenting an ineffectiveness claim, the performance inquiry must be whether counsel's assistance was reasonable considering all the circumstances. Prevailing norms of practice as reflected in American Bar Association standards and the like, e. g., ABA Standards for Criminal Justice 4-1.1 to 4-8.6 (2d ed. 1980) ("The Defense Function"), are guides to determining what is reasonable, but they are only guides. No particular set of detailed rules for counsel's conduct can satisfactorily take [466 U.S. 668, 689]   account of the variety of circumstances faced by defense counsel or the range of legitimate decisions regarding how best to represent a criminal defendant. Any such set of rules would interfere with the constitutionally protected independence of counsel and restrict the wide latitude counsel must have in making tactical decisions. See United States v. Decoster, 199 U.S. App. D.C., at 371, 624 F.2d, at 208. Indeed, the existence of detailed guidelines for representation could distract counsel from the overriding mission of vigorous advocacy of the defendant's cause. Moreover, the purpose of the effective assistance guarantee of the Sixth Amendment is not to improve the quality of legal representation, although that is a goal of considerable importance to the legal system. The purpose is simply to ensure that criminal defendants receive a fair trial.

    Judicial scrutiny of counsel's performance must be highly deferential. It is all too tempting for a defendant to second-guess counsel's assistance after conviction or adverse sentence, and it is all too easy for a court, examining counsel's defense after it has proved unsuccessful, to conclude that a particular act or omission of counsel was unreasonable. Cf. Engle v. Isaac, 456 U.S. 107, 133 -134 (1982). A fair assessment of attorney performance requires that every effort be made to eliminate the distorting effects of hindsight, to reconstruct the circumstances of counsel's challenged conduct, and to evaluate the conduct from counsel's perspective at the time. Because of the difficulties inherent in making the evaluation, a court must indulge a strong presumption that counsel's conduct falls within the wide range of reasonable professional assistance; that is, the defendant must overcome the presumption that, under the circumstances, the challenged action "might be considered sound trial strategy." See Michel v. Louisiana, supra, at 101. There are countless ways to provide effective assistance in any given case. Even the best criminal defense attorneys would not defend a particular client in the same way. See Goodpaster, [466 U.S. 668, 690]   The Trial for Life: Effective Assistance of Counsel in Death Penalty Cases, 58 N. Y. U. L. Rev. 299, 343 (1983).

    The availability of intrusive post-trial inquiry into attorney performance or of detailed guidelines for its evaluation would encourage the proliferation of ineffectiveness challenges. Criminal trials resolved unfavorably to the defendant would increasingly come to be followed by a second trial, this one of counsel's unsuccessful defense. Counsel's performance and even willingness to serve could be adversely affected. Intensive scrutiny of counsel and rigid requirements for acceptable assistance could dampen the ardor and impair the independence of defense counsel, discourage the acceptance of assigned cases, and undermine the trust between attorney and client.

    Thus, a court deciding an actual ineffectiveness claim must judge the reasonableness of counsel's challenged conduct on the facts of the particular case, viewed as of the time of counsel's conduct. A convicted defendant making a claim of ineffective assistance must identify the acts or omissions of counsel that are alleged not to have been the result of reasonable professional judgment. The court must then determine whether, in light of all the circumstances, the identified acts or omissions were outside the wide range of professionally competent assistance. In making that determination, the court should keep in mind that counsel's function, as elaborated in prevailing professional norms, is to make the adversarial testing process work in the particular case. At the same time, the court should recognize that counsel is strongly presumed to have rendered adequate assistance and made all significant decisions in the exercise of reasonable professional judgment.

    These standards require no special amplification in order to define counsel's duty to investigate, the duty at issue in this case. As the Court of Appeals concluded, strategic choices made after thorough investigation of law and facts relevant to plausible options are virtually unchallengeable; and strategic [466 U.S. 668, 691]   choices made after less than complete investigation are reasonable precisely to the extent that reasonable professional judgments support the limitations on investigation. In other words, counsel has a duty to make reasonable investigations or to make a reasonable decision that makes particular investigations unnecessary. In any ineffectiveness case, a particular decision not to investigate must be directly assessed for reasonableness in all the circumstances, applying a heavy measure of deference to counsel's judgments.

    The reasonableness of counsel's actions may be determined or substantially influenced by the defendant's own statements or actions. Counsel's actions are usually based, quite properly, on informed strategic choices made by the defendant and on information supplied by the defendant. In particular, what investigation decisions are reasonable depends critically on such information. For example, when the facts that support a certain potential line of defense are generally known to counsel because of what the defendant has said, the need for further investigation may be considerably diminished or eliminated altogether. And when a defendant has given counsel reason to believe that pursuing certain investigations would be fruitless or even harmful, counsel's failure to pursue those investigations may not later be challenged as unreasonable. In short, inquiry into counsel's conversations with the defendant may be critical to a proper assessment of counsel's investigation decisions, just as it may be critical to a proper assessment of counsel's other litigation decisions. See United States v. Decoster, supra, at 372-373, 624 F.2d, at 209-210.

    B

    An error by counsel, even if professionally unreasonable, does not warrant setting aside the judgment of a criminal proceeding if the error had no effect on the judgment. Cf. United States v. Morrison, 449 U.S. 361, 364 -365 (1981). The purpose of the Sixth Amendment guarantee of counsel is to ensure [466 U.S. 668, 692]   that a defendant has the assistance necessary to justify reliance on the outcome of the proceeding. Accordingly, any deficiencies in counsel's performance must be prejudicial to the defense in order to constitute ineffective assistance under the Constitution.

    In certain Sixth Amendment contexts, prejudice is presumed. Actual or constructive denial of the assistance of counsel altogether is legally presumed to result in prejudice. So are various kinds of state interference with counsel's assistance. See United States v. Cronic, ante, at 659, and n. 25. Prejudice in these circumstances is so likely that case-by-case inquiry into prejudice is not worth the cost. Ante, at 658. Moreover, such circumstances involve impairments of the Sixth Amendment right that are easy to identify and, for that reason and because the prosecution is directly responsible, easy for the government to prevent.

    One type of actual ineffectiveness claim warrants a similar, though more limited, presumption of prejudice. In Cuyler v. Sullivan, 446 U.S., at 345 -350, the Court held that prejudice is presumed when counsel is burdened by an actual conflict of interest. In those circumstances, counsel breaches the duty of loyalty, perhaps the most basic of counsel's duties. Moreover, it is difficult to measure the precise effect on the defense of representation corrupted by conflicting interests. Given the obligation of counsel to avoid conflicts of interest and the ability of trial courts to make early inquiry in certain situations likely to give rise to conflicts, see, e. g., Fed. Rule Crim. Proc. 44(c), it is reasonable for the criminal justice system to maintain a fairly rigid rule of presumed prejudice for conflicts of interest. Even so, the rule is not quite the per se rule of prejudice that exists for the Sixth Amendment claims mentioned above. Prejudice is presumed only if the defendant demonstrates that counsel "actively represented conflicting interests" and that "an actual conflict of interest adversely affected his lawyer's performance." Cuyler v. Sullivan, supra, at 350, 348 (footnote omitted). [466 U.S. 668, 693]  

    Conflict of interest claims aside, actual ineffectiveness claims alleging a deficiency in attorney performance are subject to a general requirement that the defendant affirmatively prove prejudice. The government is not responsible for, and hence not able to prevent, attorney errors that will result in reversal of a conviction or sentence. Attorney errors come in an infinite variety and are as likely to be utterly harmless in a particular case as they are to be prejudicial. They cannot be classified according to likelihood of causing prejudice. Nor can they be defined with sufficient precision to inform defense attorneys correctly just what conduct to avoid. Representation is an art, and an act or omission that is unprofessional in one case may be sound or even brilliant in another. Even if a defendant shows that particular errors of counsel were unreasonable, therefore, the defendant must show that they actually had an adverse effect on the defense.

    It is not enough for the defendant to show that the errors had some conceivable effect on the outcome of the proceeding. Virtually every act or omission of counsel would meet that test, cf. United States v. Valenzuela-Bernal, 458 U.S. 858, 866 -867 (1982), and not every error that conceivably could have influenced the outcome undermines the reliability of the result of the proceeding. Respondent suggests requiring a showing that the errors "impaired the presentation of the defense." Brief for Respondent 58. That standard, however, provides no workable principle. Since any error, if it is indeed an error, "impairs" the presentation of the defense, the proposed standard is inadequate because it provides no way of deciding what impairments are sufficiently serious to warrant setting aside the outcome of the proceeding.

    On the other hand, we believe that a defendant need not show that counsel's deficient conduct more likely than not altered the outcome in the case. This outcome-determinative standard has several strengths. It defines the relevant inquiry in a way familiar to courts, though the inquiry, as is inevitable, is anything but precise. The standard also reflects the profound importance of finality in criminal proceedings. [466 U.S. 668, 694]   Moreover, it comports with the widely used standard for assessing motions for new trial based on newly discovered evidence. See Brief for United States as Amicus Curiae 19-20, and nn. 10, 11. Nevertheless, the standard is not quite appropriate.

    Even when the specified attorney error results in the omission of certain evidence, the newly discovered evidence standard is not an apt source from which to draw a prejudice standard for ineffectiveness claims. The high standard for newly discovered evidence claims presupposes that all the essential elements of a presumptively accurate and fair proceeding were present in the proceeding whose result is challenged. Cf. United States v. Johnson, 327 U.S. 106, 112 (1946). An ineffective assistance claim asserts the absence of one of the crucial assurances that the result of the proceeding is reliable, so finality concerns are somewhat weaker and the appropriate standard of prejudice should be somewhat lower. The result of a proceeding can be rendered unreliable, and hence the proceeding itself unfair, even if the errors of counsel cannot be shown by a preponderance of the evidence to have determined the outcome.

    Accordingly, the appropriate test for prejudice finds its roots in the test for materiality of exculpatory information not disclosed to the defense by the prosecution, United States v. Agurs, 427 U.S., at 104 , 112-113, and in the test for materiality of testimony made unavailable to the defense by Government deportation of a witness, United States v. Valenzuela-Bernal, supra, at 872-874. The defendant must show that there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different. A reasonable probability is a probability sufficient to undermine confidence in the outcome.

    In making the determination whether the specified errors resulted in the required prejudice, a court should presume, absent challenge to the judgment on grounds of evidentiary insufficiency, that the judge or jury acted according to law. [466 U.S. 668, 695]   An assessment of the likelihood of a result more favorable to the defendant must exclude the possibility of arbitrariness, whimsy, caprice, "nullification," and the like. A defendant has no entitlement to the luck of a lawless decisionmaker, even if a lawless decision cannot be reviewed. The assessment of prejudice should proceed on the assumption that the decisionmaker is reasonably, conscientiously, and impartially applying the standards that govern the decision. It should not depend on the idiosyncracies of the particular decisionmaker, such as unusual propensities toward harshness or leniency. Although these factors may actually have entered into counsel's selection of strategies and, to that limited extent, may thus affect the performance inquiry, they are irrelevant to the prejudice inquiry. Thus, evidence about the actual process of decision, if not part of the record of the proceeding under review, and evidence about, for example, a particular judge's sentencing practices, should not be considered in the prejudice determination.

    The governing legal standard plays a critical role in defining the question to be asked in assessing the prejudice from counsel's errors. When a defendant challenges a conviction, the question is whether there is a reasonable probability that, absent the errors, the factfinder would have had a reasonable doubt respecting guilt. When a defendant challenges a death sentence such as the one at issue in this case, the question is whether there is a reasonable probability that, absent the errors, the sentencer - including an appellate court, to the extent it independently reweighs the evidence - would have concluded that the balance of aggravating and mitigating circumstances did not warrant death.

    In making this determination, a court hearing an ineffectiveness claim must consider the totality of the evidence before the judge or jury. Some of the factual findings will have been unaffected by the errors, and factual findings that were affected will have been affected in different ways. Some errors will have had a pervasive effect on the inferences to [466 U.S. 668, 696]   be drawn from the evidence, altering the entire evidentiary picture, and some will have had an isolated, trivial effect. Moreover, a verdict or conclusion only weakly supported by the record is more likely to have been affected by errors than one with overwhelming record support. Taking the unaffected findings as a given, and taking due account of the effect of the errors on the remaining findings, a court making the prejudice inquiry must ask if the defendant has met the burden of showing that the decision reached would reasonably likely have been different absent the errors.

    IV

    A number of practical considerations are important for the application of the standards we have outlined. Most important, in adjudicating a claim of actual ineffectiveness of counsel, a court should keep in mind that the principles we have stated do not establish mechanical rules. Although those principles should guide the process of decision, the ultimate focus of inquiry must be on the fundamental fairness of the proceeding whose result is being challenged. In every case the court should be concerned with whether, despite the strong presumption of reliability, the result of the particular proceeding is unreliable because of a breakdown in the adversarial process that our system counts on to produce just results.

    To the extent that this has already been the guiding inquiry in the lower courts, the standards articulated today do not require reconsideration of ineffectiveness claims rejected under different standards. Cf. Trapnell v. United States, 725 F.2d, at 153 (in several years of applying "farce and mockery" standard along with "reasonable competence" standard, court "never found that the result of a case hinged on the choice of a particular standard"). In particular, the minor differences in the lower courts' precise formulations of the performance standard are insignificant: the different [466 U.S. 668, 697]   formulations are mere variations of the overarching reasonableness standard. With regard to the prejudice inquiry, only the strict outcome-determinative test, among the standards articulated in the lower courts, imposes a heavier burden on defendants than the tests laid down today. The difference, however, should alter the merit of an ineffectiveness claim only in the rarest case.

    Although we have discussed the performance component of an ineffectiveness claim prior to the prejudice component, there is no reason for a court deciding an ineffective assistance claim to approach the inquiry in the same order or even to address both components of the inquiry if the defendant makes an insufficient showing on one. In particular, a court need not determine whether counsel's performance was deficient before examining the prejudice suffered by the defendant as a result of the alleged deficiencies. The object of an ineffectiveness claim is not to grade counsel's performance. If it is easier to dispose of an ineffectiveness claim on the ground of lack of sufficient prejudice, which we expect will often be so, that course should be followed. Courts should strive to ensure that ineffectiveness claims not become so burdensome to defense counsel that the entire criminal justice system suffers as a result.

    The principles governing ineffectiveness claims should apply in federal collateral proceedings as they do on direct appeal or in motions for a new trial. As indicated by the "cause and prejudice" test for overcoming procedural waivers of claims of error, the presumption that a criminal judgment is final is at its strongest in collateral attacks on that judgment. See United States v. Frady, 456 U.S. 152, 162 -169 (1982); Engle v. Isaac, 456 U.S. 107, 126 -129 (1982). An ineffectiveness claim, however, as our articulation of the standards that govern decision of such claims makes clear, is an attack on the fundamental fairness of the proceeding whose result is challenged. Since fundamental fairness is the central concern of the writ of habeas corpus, see id., [466 U.S. 668, 698]   at 126, no special standards ought to apply to ineffectiveness claims made in habeas proceedings.

    Finally, in a federal habeas challenge to a state criminal judgment, a state court conclusion that counsel rendered effective assistance is not a finding of fact binding on the federal court to the extent stated by 28 U.S.C. 2254(d). Ineffectiveness is not a question of "basic, primary, or historical fac[t]," Townsend v. Sain, 372 U.S. 293, 309 , n. 6 (1963). Rather, like the question whether multiple representation in a particular case gave rise to a conflict of interest, it is a mixed question of law and fact. See Cuyler v. Sullivan, 446 U.S., at 342 . Although state court findings of fact made in the course of deciding an ineffectiveness claim are subject to the deference requirement of 2254(d), and although district court findings are subject to the clearly erroneous standard of Federal Rule of Civil Procedure 52(a), both the performance and prejudice components of the ineffectiveness inquiry are mixed questions of law and fact.

    V

    Having articulated general standards for judging ineffectiveness claims, we think it useful to apply those standards to the facts of this case in order to illustrate the meaning of the general principles. The record makes it possible to do so. There are no conflicts between the state and federal courts over findings of fact, and the principles we have articulated are sufficiently close to the principles applied both in the Florida courts and in the District Court that it is clear that the factfinding was not affected by erroneous legal principles. See Pullman-Standard v. Swint, 456 U.S. 273, 291 -292 (1982).

    Application of the governing principles is not difficult in this case. The facts as described above, see supra, at 671-678, make clear that the conduct of respondent's counsel at and before respondent's sentencing proceeding cannot be found unreasonable. They also make clear that, even assuming the [466 U.S. 668, 699]   challenged conduct of counsel was unreasonable, respondent suffered insufficient prejudice to warrant setting aside his death sentence.

    With respect to the performance component, the record shows that respondent's counsel made a strategic choice to argue for the extreme emotional distress mitigating circumstance and to rely as fully as possible on respondent's acceptance of responsibility for his crimes. Although counsel understandably felt hopeless about respondent's prospects, see App. 383-384, 400-401, nothing in the record indicates, as one possible reading of the District Court's opinion suggests, see App. to Pet. for Cert. A282, that counsel's sense of hopelessness distorted his professional judgment. Counsel's strategy choice was well within the range of professionally reasonable judgments, and the decision not to seek more character or psychological evidence than was already in hand was likewise reasonable.

    The trial judge's views on the importance of owning up to one's crimes were well known to counsel. The aggravating circumstances were utterly overwhelming. Trial counsel could reasonably surmise from his conversations with respondent that character and psychological evidence would be of little help. Respondent had already been able to mention at the plea colloquy the substance of what there was to know about his financial and emotional troubles. Restricting testimony on respondent's character to what had come in at the plea colloquy ensured that contrary character and psychological evidence and respondent's criminal history, which counsel had successfully moved to exclude, would not come in. On these facts, there can be little question, even without application of the presumption of adequate performance, that trial counsel's defense, though unsuccessful, was the result of reasonable professional judgment.

    With respect to the prejudice component, the lack of merit of respondent's claim is even more stark. The evidence that respondent says his trial counsel should have offered at the [466 U.S. 668, 700]   sentencing hearing would barely have altered the sentencing profile presented to the sentencing judge. As the state courts and District Court found, at most this evidence shows that numerous people who knew respondent thought he was generally a good person and that a psychiatrist and a psychologist believed he was under considerable emotional stress that did not rise to the level of extreme disturbance. Given the overwhelming aggravating factors, there is no reasonable probability that the omitted evidence would have changed the conclusion that the aggravating circumstances outweighed the mitigating circumstances and, hence, the sentence imposed. Indeed, admission of the evidence respondent now offers might even have been harmful to his case: his "rap sheet" would probably have been admitted into evidence, and the psychological reports would have directly contradicted respondent's claim that the mitigating circumstance of extreme emotional disturbance applied to his case.

    Our conclusions on both the prejudice and performance components of the ineffectiveness inquiry do not depend on the trial judge's testimony at the District Court hearing. We therefore need not consider the general admissibility of that testimony, although, as noted supra, at 695, that testimony is irrelevant to the prejudice inquiry. Moreover, the prejudice question is resolvable, and hence the ineffectiveness claim can be rejected, without regard to the evidence presented at the District Court hearing. The state courts properly concluded that the ineffectiveness claim was meritless without holding an evidentiary hearing.

    Failure to make the required showing of either deficient performance or sufficient prejudice defeats the ineffectiveness claim. Here there is a double failure. More generally, respondent has made no showing that the justice of his sentence was rendered unreliable by a breakdown in the adversary process caused by deficiencies in counsel's assistance. Respondent's sentencing proceeding was not fundamentally unfair. [466 U.S. 668, 701]  

    We conclude, therefore, that the District Court properly declined to issue a writ of habeas corpus. The judgment of the Court of Appeals is accordingly

    JUSTICE BRENNAN, concurring in part and dissenting in part.

    I join the Court's opinion but dissent from its judgment. Adhering to my view that the death penalty is in all circumstances cruel and unusual punishment forbidden by the Eighth and Fourteenth Amendments, see Gregg v. Georgia, 428 U.S. 153, 227 (1976) (BRENNAN, J., dissenting), I would vacate respondent's death sentence and remand the case for further proceedings. 1   [466 U.S. 668, 702]  

    I

    This case and United States v. Cronic, ante, p. 648, present our first occasions to elaborate the appropriate standards for judging claims of ineffective assistance of counsel. In Cronic, the Court considers such claims in the context of cases "in which the surrounding circumstances [make] it so unlikely that any lawyer could provide effective assistance that ineffectiveness [is] properly presumed without inquiry into actual performance at trial," ante, at 661. This case, in contrast, concerns claims of ineffective assistance based on allegations of specific errors by counsel - claims which, by their very nature, require courts to evaluate both the attorney's performance and the effect of that performance on the reliability and fairness of the proceeding. Accordingly, a defendant making a claim of this kind must show not only that his lawyer's performance was inadequate but also that he was prejudiced thereby. See also Cronic, ante, at 659, n. 26.

    I join the Court's opinion because I believe that the standards it sets out today will both provide helpful guidance to courts considering claims of actual ineffectiveness of counsel and also permit those courts to continue their efforts to achieve progressive development of this area of the law. Like all federal courts and most state courts that have previously addressed the matter, see ante, at 683-684, the Court concludes that "the proper standard for attorney performance is that of reasonably effective assistance." Ante, at 687. And, [466 U.S. 668, 703]   rejecting the strict "outcome-determinative" test employed by some courts, the Court adopts as the appropriate standard for prejudice a requirement that the defendant "show that there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different," defining a "reasonable probability" as "a probability sufficient to undermine confidence in the outcome." Ante, at 694. I believe these standards are sufficiently precise to permit meaningful distinctions between those attorney derelictions that deprive defendants of their constitutional rights and those that do not; at the same time, the standards are sufficiently flexible to accommodate the wide variety of situations giving rise to claims of this kind.

    With respect to the performance standard, I agree with the Court's conclusion that a "particular set of detailed rules for counsel's conduct" would be inappropriate. Ante, at 688. Precisely because the standard of "reasonably effective assistance" adopted today requires that counsel's performance be measured in light of the particular circumstances of the case, I do not believe our decision "will stunt the development of constitutional doctrine in this area," post, at 709 (MARSHALL, J., dissenting). Indeed, the Court's suggestion that today's decision is largely consistent with the approach taken by the lower courts, ante, at 696, simply indicates that those courts may continue to develop governing principles on a case-by-case basis in the common-law tradition, as they have in the past. Similarly, the prejudice standard announced today does not erect an insurmountable obstacle to meritorious claims, but rather simply requires courts carefully to examine trial records in light of both the nature and seriousness of counsel's errors and their effect in the particular circumstances of the case. Ante, at 695. 2   [466 U.S. 668, 704]  

    II

    Because of their flexibility and the requirement that they be considered in light of the particular circumstances of the case, the standards announced today can and should be applied with concern for the special considerations that must attend review of counsel's performance in a capital sentencing proceeding. In contrast to a case in which a finding of ineffective assistance requires a new trial, a conclusion that counsel was ineffective with respect to only the penalty phase of a capital trial imposes on the State the far lesser burden of reconsideration of the sentence alone. On the other hand, the consequences to the defendant of incompetent assistance at a capital sentencing could not, of course, be greater. Recognizing the unique seriousness of such a proceeding, we have repeatedly emphasized that "`where discretion is afforded a sentencing body on a matter so grave as the determination of whether a human life should be taken or spared, that discretion must be suitably directed and limited so as to minimize the risk of wholly arbitrary and capricious action.'" Zant v. Stephens, 462 U.S. 862, 874 (1983) (quoting Gregg v. Georgia, 428 U.S., at 188 -189 (opinion of Stewart, POWELL, and STEVENS, JJ.)).

    For that reason, we have consistently required that capital proceedings be policed at all stages by an especially vigilant concern for procedural fairness and for the accuracy of factfinding. As JUSTICE MARSHALL emphasized last Term:

    See also id., at 924 (BLACKMUN, J., dissenting). In short, this Court has taken special care to minimize the possibility that death sentences are "imposed out of whim, passion, prejudice, or mistake." Eddings v. Oklahoma, 455 U.S. 104, 118 (1982) (O'CONNOR, J., concurring).

    In the sentencing phase of a capital case, "[w]hat is essential is that the jury have before it all possible relevant information about the individual defendant whose fate it must determine." Jurek v. Texas, 428 U.S. 262, 276 (1976) (opinion of Stewart, POWELL, and STEVENS, JJ.). For that reason, we have repeatedly insisted that "the sentencer in capital cases must be permitted to consider any relevant mitigating factor." Eddings v. Oklahoma, 455 U.S., at 112 . In fact, as JUSTICE O'CONNOR has noted, a sentencing judge's failure to consider relevant aspects of a defendant's character and background creates such an unacceptable risk that the death penalty was unconstitutionally imposed that, even in cases where the matter was not raised below, the "interests of justice" may impose on reviewing courts "a duty to remand [the] case for resentencing." Id., at 117, n., and 119 (O'CONNOR, J., concurring). [466 U.S. 668, 706]  

    Of course, "[t]he right to present, and to have the sentencer consider, any and all mitigating evidence means little if defense counsel fails to look for mitigating evidence or fails to present a case in mitigation at the capital sentencing hearing." Comment, 83 Colum. L. Rev. 1544, 1549 (1983). See, e. g., Burger v. Zant, 718 F.2d 979 (CA11 1983) (defendant, 17 years old at time of crime, sentenced to death after counsel failed to present any evidence in mitigation), stay granted, post, at 902. Accordingly, counsel's general duty to investigate, ante, at 690, takes on supreme importance to a defendant in the context of developing mitigating evidence to present to a judge or jury considering the sentence of death; claims of ineffective assistance in the performance of that duty should therefore be considered with commensurate care.

    That the Court rejects the ineffective-assistance claim in this case should not, of course, be understood to reflect any diminution in commitment to the principle that "`the fundamental respect for humanity underlying the Eighth Amendment . . . requires consideration of the character and record of the individual offender and the circumstances of the particular offense as a constitutionally indispensable part of the process of inflicting the penalty of death.'" Eddings v. Oklahoma, supra, at 112 (quoting Woodson v. North Carolina, 428 U.S. 280, 304 (1976) (opinion of Stewart, POWELL, and STEVENS, JJ.)). I am satisfied that the standards announced today will go far towards assisting lower federal courts and state courts in discharging their constitutional duty to ensure that every criminal defendant receives the effective assistance of counsel guaranteed by the Sixth Amendment.

    Footnotes

    [ Footnote 1 ] The Court's judgment leaves standing another in an increasing number of capital sentences purportedly imposed in compliance with the procedural standards developed in cases beginning with Gregg v. Georgia, 428 U.S. 153 (1976). Earlier this Term, I reiterated my view that these procedural requirements have proven unequal to the task of eliminating the irrationality that necessarily attends decisions by juries, trial judges, and appellate courts whether to take or spare human life. Pulley v. Harris, 465 U.S. 37, 59 (1984) (BRENNAN, J., dissenting). The inherent difficulty in imposing the ultimate sanction consistent with the rule of law, see Furman v. Georgia, 408 U.S. 238, 274 -277 (1972) (BRENNAN, J., concurring); McGautha v. California, 402 U.S. 183, 248 -312 (1971) (BRENNAN, J., dissenting), is confirmed by the extraordinary pressure put on our own deliberations in recent months by the growing number of applications to stay executions. See Wainwright v. Adams, post, at 965 (MARSHALL, J., dissenting) (stating that "haste and confusion surrounding . . . decision [to vacate stay] is degrading to our role as judges"); Autry v. McKaskle, 465 U.S. 1085 (1984) (MARSHALL, J., dissenting) (criticizing Court for "dramatically expediting its normal deliberative processes to clear the way for an impending execution"); Stephens v. Kemp, 464 U.S. 1027, 1032 (1983) (POWELL, J., dissenting) (contending that procedures by which stay applications are considered "undermines public confidence in the courts and in the laws we are required to follow"); Sullivan v. Wainwright, 464 U.S. 109, 112 (1983) (BURGER, C. J., concurring) (accusing lawyers seeking review of their client's death sentences of turning "the [466 U.S. 668, 702]   administration of justice into [a] sporting contest"); Autry v. Estelle, 464 U.S. 1, 6 (1983) (STEVENS, J., dissenting) (suggesting that Court's practice in reviewing applications in death cases "injects uncertainty and disparity into the review procedure, adds to the burdens of counsel, distorts the deliberative process within this Court, and increases the risk of error"). It is difficult to believe that the decision whether to put an individual to death generates any less emotional pressure among juries, trial judges, and appellate courts than it does among Members of this Court.

    [ Footnote 2 ] Indeed, counsel's incompetence can be so serious that it rises to the level of a constructive denial of counsel which can constitute constitutional error without any showing of prejudice. See Cronic, ante, at 659-660; [466 U.S. 668, 704]   Javor v. United States, 724 F.2d 831, 834 (CA9 1984) ("Prejudice is inherent in this case because unconscious or sleeping counsel is equivalent to no counsel at all").

    JUSTICE MARSHALL, dissenting.

    The Sixth and Fourteenth Amendments guarantee a person accused of a crime the right to the aid of a lawyer in preparing and presenting his defense. It has long been settled that "the right to counsel is the right to the effective assistance [466 U.S. 668, 707]   of counsel." McMann v. Richardson, 397 U.S. 759, 771 , n. 14 (1970). The state and lower federal courts have developed standards for distinguishing effective from inadequate assistance. 1 Today, for the first time, this Court attempts to synthesize and clarify those standards. For the most part, the majority's efforts are unhelpful. Neither of its two principal holdings seems to me likely to improve the adjudication of Sixth Amendment claims. And, in its zeal to survey comprehensively this field of doctrine, the majority makes many other generalizations and suggestions that I find unacceptable. Most importantly, the majority fails to take adequate account of the fact that the locus of this case is a capital sentencing proceeding. Accordingly, I join neither the Court's opinion nor its judgment.

    I

    The opinion of the Court revolves around two holdings. First, the majority ties the constitutional minima of attorney performance to a simple "standard of reasonableness." Ante, at 688. Second, the majority holds that only an error of counsel that has sufficient impact on a trial to "undermine confidence in the outcome" is grounds for overturning a conviction. Ante, at 694. I disagree with both of these rulings.

    A

    My objection to the performance standard adopted by the Court is that it is so malleable that, in practice, it will either have no grip at all or will yield excessive variation in the manner in which the Sixth Amendment is interpreted and applied by different courts. To tell lawyers and the lower courts that counsel for a criminal defendant must behave [466 U.S. 668, 708]   "reasonably" and must act like "a reasonably competent attorney," ante, at 687, is to tell them almost nothing. In essence, the majority has instructed judges called upon to assess claims of ineffective assistance of counsel to advert to their own intuitions regarding what constitutes "professional" representation, and has discouraged them from trying to develop more detailed standards governing the performance of defense counsel. In my view, the Court has thereby not only abdicated its own responsiblity to interpret the Constitution, but also impaired the ability of the lower courts to exercise theirs.

    The debilitating ambiguity of an "objective standard of reasonableness" in this context is illustrated by the majority's failure to address important issues concerning the quality of representation mandated by the Constitution. It is an unfortunate but undeniable fact that a person of means, by selecting a lawyer and paying him enough to ensure he prepares thoroughly, usually can obtain better representation than that available to an indigent defendant, who must rely on appointed counsel, who, in turn, has limited time and resources to devote to a given case. Is a "reasonably competent attorney" a reasonably competent adequately paid retained lawyer or a reasonably competent appointed attorney? It is also a fact that the quality of representation available to ordinary defendants in different parts of the country varies significantly. Should the standard of performance mandated by the Sixth Amendment vary by locale? 2 The majority offers no clues as to the proper responses to these questions.

    The majority defends its refusal to adopt more specific standards primarily on the ground that "[n]o particular set of detailed rules for counsel's conduct can satisfactorily take account [466 U.S. 668, 709]   of the variety of circumstances faced by defense counsel or the range of legitimate decisions regarding how best to represent a criminal defendant." Ante, at 688-689. I agree that counsel must be afforded "wide latitude" when making "tactical decisions" regarding trial strategy, see ante, at 689; cf. infra, at 712, 713, but many aspects of the job of a criminal defense attorney are more amenable to judicial oversight. For example, much of the work involved in preparing for a trial, applying for bail, conferring with one's client, making timely objections to significant, arguably erroneous rulings of the trial judge, and filing a notice of appeal if there are colorable grounds therefor could profitably be made the subject of uniform standards.

    The opinion of the Court of Appeals in this case represents one sound attempt to develop particularized standards designed to ensure that all defendants receive effective legal assistance. See 693 F.2d 1243, 1251-1258 (CA5 1982) (en banc). For other, generally consistent efforts, see United States v. Decoster, 159 U.S. App. D.C. 326, 333-334, 487 F.2d 1197, 1203-1204 (1973), disapproved on rehearing, 199 U.S. App. D.C. 359, 624 F.2d 196 (en banc), cert. denied, 444 U.S. 944 (1979); Coles v. Peyton, 389 F.2d 224, 226 (CA4), cert. denied, 393 U.S. 849 (1968); People v. Pope, 23 Cal. 3d 412, 424-425, 590 P.2d 859, 866 (1979); State v. Harper, 57 Wis. 2d 543, 550-557, 205 N. W. 2d 1, 6-9 (1973). 3 By refusing to address the merits of these proposals, and indeed suggesting that no such effort is worthwhile, the opinion of the Court, I fear, will stunt the development of constitutional doctrine in this area. [466 U.S. 668, 710]  

    B

    I object to the prejudice standard adopted by the Court for two independent reasons. First, it is often very difficult to tell whether a defendant convicted after a trial in which he was ineffectively represented would have fared better if his lawyer had been competent. Seemingly impregnable cases can sometimes be dismantled by good defense counsel. On the basis of a cold record, it may be impossible for a reviewing court confidently to ascertain how the government's evidence and arguments would have stood up against rebuttal and cross-examination by a shrewd, well-prepared lawyer. The difficulties of estimating prejudice after the fact are exacerbated by the possibility that evidence of injury to the defendant may be missing from the record precisely because of the incompetence of defense counsel. 4 In view of all these impediments to a fair evaluation of the probability that the outcome of a trial was affected by ineffectiveness of counsel, it seems to me senseless to impose on a defendant whose lawyer has been shown to have been incompetent the burden of demonstrating prejudice. [466 U.S. 668, 711]  

    Second and more fundamentally, the assumption on which the Court's holding rests is that the only purpose of the constitutional guarantee of effective assistance of counsel is to reduce the chance that innocent persons will be convicted. In my view, the guarantee also functions to ensure that convictions are obtained only through fundamentally fair procedures. 5 The majority contends that the Sixth Amendment is not violated when a manifestly guilty defendant is convicted after a trial in which he was represented by a manifestly ineffective attorney. I cannot agree. Every defendant is entitled to a trial in which his interests are vigorously and conscientiously advocated by an able lawyer. A proceeding in which the defendant does not receive meaningful assistance in meeting the forces of the State does not, in my opinion, constitute due process.

    In Chapman v. California, 386 U.S. 18, 23 (1967), we acknowledged that certain constitutional rights are "so basic to a fair trial that their infraction can never be treated as harmless error." Among these rights is the right to the assistance of counsel at trial. Id., at 23, n. 8; see Gideon v. Wainwright, 372 U.S. 335 (1963). 6 In my view, the right [466 U.S. 668, 712]   to effective assistance of counsel is entailed by the right to counsel, and abridgment of the former is equivalent to abridgment of the latter. 7 I would thus hold that a showing that the performance of a defendant's lawyer departed from constitutionally prescribed standards requires a new trial regardless of whether the defendant suffered demonstrable prejudice thereby.

    II

    Even if I were inclined to join the majority's two central holdings, I could not abide the manner in which the majority elaborates upon its rulings. Particularly regrettable are the majority's discussion of the "presumption" of reasonableness to be accorded lawyers' decisions and its attempt to prejudge the merits of claims previously rejected by lower courts using different legal standards.

    A

    In defining the standard of attorney performance required by the Constitution, the majority appropriately notes that many problems confronting criminal defense attorneys admit of "a range of legitimate" responses. Ante, at 689. And the majority properly cautions courts, when reviewing a lawyer's selection amongst a set of options, to avoid the hubris of hindsight. Ibid. The majority goes on, however, to suggest that reviewing courts should "indulge a strong presumption that counsel's conduct" was constitutionally acceptable, ibid.; see ante, at 690, 696, and should "appl[y] a heavy measure of deference to counsel's judgments," ante, at 691.

    I am not sure what these phrases mean, and I doubt that they will be self-explanatory to lower courts. If they denote nothing more than that a defendant claiming he was denied effective assistance of counsel has the burden of proof, I [466 U.S. 668, 713]   would agree. See United States v. Cronic, ante, at 658. But the adjectives "strong" and "heavy" might be read as imposing upon defendants an unusually weighty burden of persuasion. If that is the majority's intent, I must respectfully dissent. The range of acceptable behavior defined by "prevailing professional norms," ante, at 688, seems to me sufficiently broad to allow defense counsel the flexibility they need in responding to novel problems of trial strategy. To afford attorneys more latitude, by "strongly presuming" that their behavior will fall within the zone of reasonableness, is covertly to legitimate convictions and sentences obtained on the basis of incompetent conduct by defense counsel.

    The only justification the majority itself provides for its proposed presumption is that undue receptivity to claims of ineffective assistance of counsel would encourage too many defendants to raise such claims and thereby would clog the courts with frivolous suits and "dampen the ardor" of defense counsel. See ante, at 690. I have more confidence than the majority in the ability of state and federal courts expeditiously to dispose of meritless arguments and to ensure that responsible, innovative lawyering is not inhibited. In my view, little will be gained and much may be lost by instructing the lower courts to proceed on the assumption that a defendant's challenge to his lawyer's performance will be insubstantial.

    B

    For many years the lower courts have been debating the meaning of "effective" assistance of counsel. Different courts have developed different standards. On the issue of the level of performance required by the Constitution, some courts have adopted the forgiving "farce-and-mockery" standard, 8 while others have adopted various versions of [466 U.S. 668, 714]   the "reasonable competence" standard. 9 On the issue of the level of prejudice necessary to compel a new trial, the courts have taken a wide variety of positions, ranging from the stringent "outcome-determinative" test, 10 to the rule that a showing of incompetence on the part of defense counsel automatically requires reversal of the conviction regardless of the injury to the defendant. 11  

    The Court today substantially resolves these disputes. The majority holds that the Constitution is violated when defense counsel's representation falls below the level expected of reasonably competent defense counsel, ante, at 687-691, and so affects the trial that there is a "reasonable probability" that, absent counsel's error, the outcome would have been different, ante, at 691-696.

    Curiously, though, the Court discounts the significance of its rulings, suggesting that its choice of standards matters little and that few if any cases would have been decided differently if the lower courts had always applied the tests announced today. See ante, at 696-697. Surely the judges in the state and lower federal courts will be surprised to learn that the distinctions they have so fiercely debated for many years are in fact unimportant.

    The majority's comments on this point seem to be prompted principally by a reluctance to acknowledge that today's decision will require a reassessment of many previously rejected ineffective-assistance-of-counsel claims. The majority's unhappiness on this score is understandable, but its efforts to mitigate the perceived problem will be ineffectual. Nothing the majority says can relieve lower courts that hitherto [466 U.S. 668, 715]   have been using standards more tolerant of ineffectual advocacy of their obligation to scrutinize all claims, old as well as new, under the principles laid down today.

    III

    The majority suggests that, "[f]or purposes of describing counsel's duties," a capital sentencing proceeding "need not be distinguished from an ordinary trial." Ante, at 687. I cannot agree.

    The Court has repeatedly acknowledged that the Constitution requires stricter adherence to procedural safeguards in a capital case than in other cases.

    The performance of defense counsel is a crucial component of the system of protections designed to ensure that capital punishment is administered with some degree of rationality. "Reliability" in the imposition of the death sentence can be approximated only if the sentencer is fully informed of "all possible relevant information about the individual defendant whose fate it must determine." Jurek v. Texas, 428 U.S. 262, 276 (1976) (opinion of Stewart, POWELL, and STEVENS, JJ.). The job of amassing that information and presenting it [466 U.S. 668, 716]   in an organized and persuasive manner to the sentencer is entrusted principally to the defendant's lawyer. The importance to the process of counsel's efforts, 13 combined with the severity and irrevocability of the sanction at stake, require that the standards for determining what constitutes "effective assistance" be applied especially stringently in capital sentencing proceedings. 14  

    It matters little whether strict scrutiny of a claim that ineffectiveness of counsel resulted in a death sentence is achieved through modification of the Sixth Amendment standards or through especially careful application of those standards. JUSTICE BRENNAN suggests that the necessary adjustment of the level of performance required of counsel in capital sentencing proceedings can be effected simply by construing the phrase, "reasonableness under prevailing professional norms," in a manner that takes into account the nature of the impending penalty. Ante, at 704-706. Though I would prefer a more specific iteration of counsel's duties in this special context, 15 I can accept that proposal. However, when instructing lower courts regarding the probability of impact upon the outcome that requires a resentencing, I think the Court would do best explicitly to modify the legal standard itself. 16 In my view, a person on death row, whose counsel's performance fell below constitutionally acceptable levels, should not be compelled to demonstrate a "reasonable probability" [466 U.S. 668, 717]   that he would have been given a life sentence if his lawyer had been competent, see ante, at 694; if the defendant can establish a significant chance that the outcome would have been different, he surely should be entitled to a redetermination of his fate. Cf. United States v. Agurs, 427 U.S. 97, 121 -122 (1976) (MARSHALL, J., dissenting). 17  

    IV

    The views expressed in the preceding section oblige me to dissent from the majority's disposition of the case before us. 18 It is undisputed that respondent's trial counsel made virtually no investigation of the possibility of obtaining testimony from respondent's relatives, friends, or former employers pertaining to respondent's character or background. Had counsel done so, he would have found several persons willing and able to testify that, in their experience, respondent was a responsible, nonviolent man, devoted to his family, and active in the affairs of his church. See App. 338-365. Respondent contends that his lawyer could have and should have used that testimony to "humanize" respondent, to counteract the impression conveyed by the trial that he was little more than a cold-blooded killer. Had this evidence been admitted, respondent argues, his chances of obtaining a life sentence would have been significantly better. [466 U.S. 668, 718]  

    Measured against the standards outlined above, respondent's contentions are substantial. Experienced members of the death-penalty bar have long recognized the crucial importance of adducing evidence at a sentencing proceeding that establishes the defendant's social and familial connections. See Goodpaster, The Trial for Life: Effective Assistance of Counsel in Death Penalty Cases, 58 N. Y. U. L. Rev. 299, 300-303, 334-335 (1983). The State makes a colorable - though in my view not compelling - argument that defense counsel in this case might have made a reasonable "strategic" decision not to present such evidence at the sentencing hearing on the assumption that an unadorned acknowledgment of respondent's responsibility for his crimes would be more likely to appeal to the trial judge, who was reputed to respect persons who accepted responsibility for their actions. 19 But however justifiable such a choice might have been after counsel had fairly assessed the potential strength of the mitigating evidence available to him, counsel's failure to make any significant effort to find out what evidence might be garnered from respondent's relatives and acquaintances surely cannot be described as "reasonable." Counsel's failure to investigate is particularly suspicious in light of his candid admission that respondent's confessions and conduct in the course of the trial gave him a feeling of "hopelessness" regarding the possibility of saving respondent's life, see App. 383-384, 400-401. [466 U.S. 668, 719]  

    That the aggravating circumstances implicated by respondent's criminal conduct were substantial, see ante, at 700, does not vitiate respondent's constitutional claim; judges and juries in cases involving behavior at least as egregious have shown mercy, particularly when afforded an opportunity to see other facets of the defendant's personality and life. 20 Nor is respondent's contention defeated by the possibility that the material his counsel turned up might not have been sufficient to establish a statutory mitigating circumstance under Florida law; Florida sentencing judges and the Florida Supreme Court sometimes refuse to impose death sentences in cases "in which, even though statutory mitigating circumstances do not outweigh statutory aggravating circumstances, the addition of nonstatutory mitigating circumstances tips the scales in favor of life imprisonment." Barclay v. Florida, 463 U.S. 939, 964 (1983) (STEVENS, J., concurring in judgment) (emphasis in original).

    If counsel had investigated the availability of mitigating evidence, he might well have decided to present some such material at the hearing. If he had done so, there is a significant chance that respondent would have been given a life sentence. In my view, those possibilities, conjoined with the unreasonableness of counsel's failure to investigate, are more than sufficient to establish a violation of the Sixth Amendment and to entitle respondent to a new sentencing proceeding.

    I respectfully dissent.

    [ Footnote 1 ] See Note, Identifying and Remedying Ineffective Assistance of Criminal Defense Counsel: A New Look After United States v. Decoster, 93 Harv. L. Rev. 752, 756-758 (1980); Note, Effective Assistance of Counsel: The Sixth Amendment and the Fair Trial Guarantee, 50 U. Chi. L. Rev. 1380, 1386-1387, 1399-1401, 1408-1410 (1983).

    [ Footnote 2 ] Cf., e. g., Moore v. United States, 432 F.2d 730, 736 (CA3 1970) (defining the constitutionally required level of performance as "the exercise of the customary skill and knowledge which normally prevails at the time and place").

    [ Footnote 3 ] For a review of other decisions attempting to develop guidelines for assessment of ineffective-assistance-of-counsel claims, see Erickson, Standards of Competency for Defense Counsel in a Criminal Case, 17 Am. Crim. L. Rev. 233, 242-248 (1979). Many of these decisions rely heavily on the standards developed by the American Bar Association. See ABA Standards for Criminal Justice 4-1.1 - 4-8.6 (2d ed. 1980).

    [ Footnote 4 ] Cf. United States v. Ellison, 557 F.2d 128, 131 (CA7 1977). In discussing the related problem of measuring injury caused by joint representation of conflicting interests, we observed:

    When defense counsel fails to take certain actions, not because he is "compelled" to do so, but because he is incompetent, it is often equally difficult to ascertain the prejudice consequent upon his omissions.

    [ Footnote 5 ] See United States v. Decoster, 199 U.S. App. D.C. 359, 454-457, 624 F.2d 196, 291-294 (en banc) (Bazelon, J., dissenting), cert. denied, 444 U.S. 944 (1979); Note, 93 Harv. L. Rev., at 767-770.

    [ Footnote 6 ] In cases in which the government acted in a way that prevented defense counsel from functioning effectively, we have refused to require the defendant, in order to obtain a new trial, to demonstrate that he was injured. In Glasser v. United States, 315 U.S. 60, 75 -76 (1942), for example, we held:

    As the Court today acknowledges, United States v. Cronic, ante, at 662, n. 31, whether the government or counsel himself is to blame for the inadequacy of the legal assistance received by a defendant should make no difference in deciding whether the defendant must prove prejudice.

    [ Footnote 7 ] See United States v. Yelardy, 567 F.2d 863, 865, n. 1 (CA6), cert. denied, 439 U.S. 842 (1978); Beasley v. United States, 491 F.2d 687, 696 (CA6 1974); Commonwealth v. Badger, 482 Pa. 240, 243-244, 393 A. 2d 642, 644 (1978).

    [ Footnote 8 ] See, e. g., State v. Pacheco, 121 Ariz. 88, 91, 588 P.2d 830, 833 (1978); Hoover v. State, 270 Ark. 978, 980, 606 S. W. 2d 749, 751 (1980); Line v. State, 272 Ind. 353, 354-355, 397 N. E. 2d 975, 976 (1979).

    [ Footnote 9 ] See, e. g., Trapnell v. United States, 725 F.2d 149, 155 (CA2 1983); Cooper v. Fitzharris, 586 F.2d 1325, 1328-1330 (CA9 1978) (en banc), cert. denied, 440 U.S. 974 (1979).

    [ Footnote 10 ] See, e. g., United States v. Decoster, 199 U.S. App. D.C., at 370, and n. 74, 624 F.2d, at 208, and n. 74 (plurality opinion); Knight v. State, 394 So.2d 997, 1001 (Fla. 1981).

    [ Footnote 11 ] See n. 7, supra.

    [ Footnote 12 ] See also Zant v. Stephens, 462 U.S. 862, 884 -885 (1983); Eddings v. Oklahoma, 455 U.S. 104, 110 -112 (1982); Lockett v. Ohio, 438 U.S. 586, 604 (1978) (plurality opinion).

    [ Footnote 13 ] See Goodpaster, The Trial for Life: Effective Assistance of Counsel in Death Penalty Cases, 58 N. Y. U. L. Rev. 299, 303 (1983).

    [ Footnote 14 ] As JUSTICE BRENNAN points out, ante, at 704, an additional reason for examining especially carefully a Sixth Amendment challenge when it pertains to a capital sentencing proceeding is that the result of finding a constitutional violation in that context is less disruptive than a finding that counsel was incompetent in the liability phase of a trial.

    [ Footnote 15 ] See Part I-A, supra. For a sensible effort to formulate guidelines for the conduct of defense counsel in capital sentencing proceedings, see Goodpaster, supra, at 343-345, 360-362.

    [ Footnote 16 ] For the purposes of this and the succeeding section, I assume, solely for the sake of argument, that some showing of prejudice is necessary to state a violation of the Sixth Amendment. But cf. Part I-B, supra.

    [ Footnote 17 ] As I read the opinion of the Court, it does not preclude this kind of adjustment of the legal standard. The majority defines "reasonable probability" as "a probability sufficient to undermine confidence in the outcome." Ante, at 694. In view of the nature of the sanction at issue, and the difficulty of determining how a sentencer would have responded if presented with a different set of facts, it could be argued that a lower estimate of the likelihood that the outcome of a capital sentencing proceeding was influenced by attorney error is sufficient to "undermine confidence" in that outcome than would be true in an ordinary criminal case.

    [ Footnote 18 ] Adhering to my view that the death penalty is unconstitutional under all circumstances, Gregg v. Georgia, 428 U.S. 153, 231 (1976) (MARSHALL, J., dissenting), I would vote to vacate respondent's sentence even if he had not presented a substantial Sixth Amendment claim.

    [ Footnote 19 ] Two considerations undercut the State's explanation of counsel's decision. First, it is not apparent why adducement of evidence pertaining to respondent's character and familial connections would have been inconsistent with respondent's acknowledgment that he was responsible for his behavior. Second, the Florida Supreme Court possesses - and frequently exercises - the power to overturn death sentences it deems unwarranted by the facts of a case. See State v. Dixon, 283 So.2d 1, 10 (1973). Even if counsel's decision not to try to humanize respondent for the benefit of the trial judge were deemed reasonable, counsel's failure to create a record for the benefit of the State Supreme Court might well be deemed unreasonable.

    [ Footnote 20 ] See, e. g., Farmer & Kinard, The Trial of the Penalty Phase (1976), reprinted in 2 California State Public Defender, California Death Penalty Manual N-33, N-45 (1980). [466 U.S. 668, 720]  

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