Originally published in 1966 the author challenges the accepted theories of group conflict of the time, such as frustration and maladjustment. For him conflict and its accompanying aggressiveness are features of interaction between groups and he supports this theory with a detailed experimental study of controlled groups.

At the time of publication, Dr Otto Klineberg, Director of the International Centre for Intergroup Relations at the Sorbonne wrote: ‘Social scientists everywhere owe a great debt of gratitude to Professor Sherif. The distinguished series of publications for which...