Roger S. Clark, who teaches at the Rutgers School of Law in Camden, N.J., and was one of the leaders of the movement to have the institute condemn the death penalty outright, said he was satisfied with the compromise. “Capital punishment is going to be around for a while,” Professor Clark said. “What this does is pull the plug on the whole intellectual underpinnings for it.”

The framework the institute developed in 1962 was an effort to make the death penalty less arbitrary. It proposed limiting capital crimes to murder and narrowing the categories of people eligible for the punishment. Most important, it gave juries a framework to decide whom to put to death, asking them to balance aggravating factors against mitigating ones.

The move to combat arbitrariness without giving up sensitivity to individual circumstances is known as “guided discretion,” which sounds good until you notice that it is a phrase at war with itself.

The Supreme Court’s capital justice jurisprudence since 1976 has only complicated things. Justice Harry A. Blackmun conceded in 1987 that “there perhaps is an inherent tension between the discretion accorded capital sentencing juries and the guidance for use of that discretion that is constitutionally required.”

That was an understatement, Justice Antonin Scalia said in 1990. “To acknowledge that ‘there perhaps is an inherent tension,’ ” he wrote, “is rather like saying that there was perhaps an inherent tension between the Allies and the Axis powers in World War II.”

Justice Scalia solved the problem by vowing never to throw out a death sentence on the ground that the sentencer’s discretion had been unconstitutionally restricted.

In 1994, Justice Blackmun came around to the view that “guided discretion” amounted to “irreconcilable constitutional commands.” But he drew a different conclusion than Justice Scalia had from the same premise, saying that “the death penalty cannot be administered in accord with our Constitution.” He said he would no longer “tinker with the machinery of death.” The institute came to essentially the same conclusion.