Claims that group cohesiveness has proven to be astonishingly difficult to define precisely and consistently, although it remains a critical group-level variable. Notes that some researchers rely on classic definitions while others leave it undefined. Suggests that greater focus on the definitional issue should improve the quality of future…

Tested Sherif and Sherif's hypotheses on intergroup competition and cooperation in a natural setting involving a scout camp for well-acquainted subjects rather than for previously unacquainted subjects. In-group solidarity showed no increase during camps, as would have been predicted by the Sherifs; indeed a decrease was found. (LLL)