Per Curiam.
The motion to proceed in forma pauperis is granted. The petition for a writ of certiorari is also granted, limited to one issue: Should petitioner’s conviction be reversed because the United States District Judge who accepted his guilty plea failed to comply with Rule 11 of the Federal Rules of Criminal Procedure? In our recent decision of McCarthy v. United States, ante, p. 459, we held that when a guilty plea is accepted in violation of Rule 11 the defendant must be afforded an opportunity to plead anew. Petitioner’s plea was entered in 1954. The question we must decide, therefore, is whether McCarthy should be applied to guilty pleas accepted prior to the date of that decision. We hold that it should not.
After an evidentiary hearing on October 17, 1967, petitioner’s motion to set aside his sentence under 28 U. S. C. § 2255 was denied by the United States District Court for the District of Massachusetts. The United States Court of Appeals for the First Circuit affirmed per curiam. Although it acknowledged that the District Court had not complied with Rule 11 when it accepted petitioner’s plea, it held that he was not entitled to relief because “ample evidence” supported the District Court’s finding that the Government had met its burden of demonstrating that petitioner entered his plea voluntarily with an understanding of the nature of the charges against him.
In deciding whether to apply newly adopted constitutional rulings retroactively, we have considered three criteria: (1) the purpose of the new rule; (2) the extent of reliance upon the old rule; and (3) the effect retroactive application would have upon the administration of justice. E. g., Desist v. United States, ante, p. 244; Stovall v. Denno, 388 U. S. 293 (1967); Johnson v. New Jersey, 384 U. S. 719 (1966). In McCarthy we took care to note that our holding was based solely upon the application of Rule 11 and not upon constitutional grounds. Nevertheless, it is appropriate to analyze the question of that decision’s retroactivity in terms of the same criteria we have employed to determine whether constitutionally grounded decisions that depart from precedent should be applied retroactively. See Linkletter v. Walker, 381 U. S. 618, 622-629 (1965).
The rule we adopted in McCarthy has two purposes: (1) to insure that every defendant who pleads guilty is afforded Rule ll’s procedural safeguards, which are designed to facilitate the determination of the voluntariness of his plea; (2) to provide a complete record at the time the plea is entered of the factors relevant to this determination, thereby facilitating a more expeditious disposition of a post-conviction attack on the plea. Unquestionably, strict compliance with Rule 11 enhances the reliability of the voluntariness determination, and we have retroactively applied constitutionally grounded rules of criminal procedure designed to correct “serious flaws in the fact-finding process at trial.” Stovall v. Denno, supra, at 298. However, a defendant whose plea has been accepted without full compliance with Rule 11 may still resort to appropriate post-conviction remedies to attack his plea’s voluntariness. Thus, if his plea was accepted prior to our decision in McCarthy, he is not without a remedy to correct constitutional defects in his conviction. Cf. Johnson v. New Jersey, supra, at 730. And as we pointed out in Stovall, the extent to which a “condemned practice infects the integrity of the truth-determining process . . . must ... be weighed against the prior justified reliance upon the old standard and the impact of retroactivity upon the administration of justice.” Stovall v. Denno, supra, at 298. In McCarthy we noted that the practice we were requiring had been previously followed by only one Circuit; that over 85% of all convictions in the federal courts are obtained pursuant to guilty pleas; and that prior to Rule ll’s recent amendment, not all district judges personally questioned defendants before accepting their guilty pleas. Thus, in view of the general application of Rule 11 in a manner inconsistent with our holding in McCarthy, and in view of the large number of constitutionally valid convictions that may have been obtained without full compliance with Rule 11, we decline to apply McCarthy retroactively. We hold that only those defendants whose guilty pleas were accepted after April 2, 1969, are entitled to plead anew if their pleas were accepted without full compliance with Rule 11.
Accordingly, the judgment of the Court of Appeals for the First Circuit is
Affirmed.