 Stevenson also appeals, in passing, to an argument from the best explanation about the cause of the disparity of ethical views that often occur between people of widely different generations, ethnic or geographic locations. According Stevenson, the disparity is adequately explained if ethical disagreement were essentially disagreement in attitude, “for different temperaments, social needs, and group pressures would more directly and urgently lead these people to have opposed attitudes than it would lead them to have opposed factual beliefs” (1944, 18).