396
Opinion of the Court
sort.6 We granted certiorari to resolve the conflict. 506 U. S. 1033 (1992).
II
A criminal defendant may not be tried unless he is competent, Pate v. Robinson, 383 U. S. 375, 378 (1966), and he may not waive his right to counsel or plead guilty unless he does so "competently and intelligently," Johnson v. Zerbst, 304 U. S. 458, 468 (1938); accord, Brady v. United States, 397 U. S. 742, 758 (1970). In Dusky v. United States, 362 U. S. 402 (1960) (per curiam), we held that the standard for competence to stand trial is whether the defendant has "sufficient present ability to consult with his lawyer with a reasonable degree of rational understanding" and has "a rational as well as factual understanding of the proceedings against him." Ibid. (internal quotation marks omitted). Accord, Drope v. Missouri, 420 U. S. 162, 171 (1975) ("[A] person whose mental condition is such that he lacks the capacity to understand the nature and object of the proceedings against him, to consult with counsel, and to assist in preparing his defense may not be subjected to a trial"). While we have described the standard for competence to stand trial, however, we have never expressly articulated a standard for competence to plead guilty or to waive the right to the assistance of counsel.
Relying in large part upon our decision in Westbrook v. Arizona, 384 U. S. 150 (1966) (per curiam), the Ninth Circuit adheres to the view that the competency standard for pleading guilty or waiving the right to counsel is higher than the competency standard for standing trial. See Sieling v. Eyman, 478 F. 2d 211, 214-215 (1973) (first Ninth Circuit
6 Compare, e. g., State v. Sims, 118 Ariz. 210, 215, 575 P. 2d 1236, 1241 (1978) (heightened standard for guilty plea); and Pickens v. State, 96 Wis. 2d 549, 567-568, 292 N. W. 2d 601, 610-611 (1980) (heightened standard for waiver of counsel), with People v. Heral, 62 Ill. 2d 329, 334, 342 N. E. 2d 34, 37 (1976) (identical standard for pleading guilty and standing trial); and People v. Reason, 37 N. Y. 2d 351, 353-354, 334 N. E. 2d 572, 574 (1975) (identical standard for waiving counsel and standing trial).
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