At school, pupils often cooperate on common projects and must coordinate their different individual actions. However, grades are pervasively used even in cooperative situations, which make the pupils' differences in achievement and their relative rank salient and may reduce their inclination to work constructively with others. Thus, we…

High attrition in technical training courses in Army Service Schools was found to be a major problem during the years 1962 to 1965. Data obtained at the U.S. Army Air Defense School showed that students who volunteered specifically for their training had significantly lower attrition rates than students of comparable aptitude who were assigned to…