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Having just read “To Err Is Human,” I want to add some comments. I led men in combat in World War II when we overran several concentration camps. My men held their anger, and not one went below the line to become an animal just because the other guy had. I’d like to point out that any group needs one strong leader. I say to researcher Zimbardo, put one good leader in charge of your experiments and see the difference.

Curtis R. Whiteway
Craftsbury, Vt.

“Regression to the mean” doesn’t imply that the average of an individual’s repeated test scores converges to the group mean, but rather that the average of each individual’s repeated scores converges toward his or her individual mean and that the average of the group’s repeated test scores converges toward the group mean.

John Reid
Salt Lake City, Utah