This study compares three six-week programs for weight control that were followed by several booster sessions and a 15-week followup. Although subjects in all programs showed significant weight losses (an average of 8.1 pounds for the 22 weeks), no significant differences between groups emphasizing stimulus control, reinforcement or general discussion were found. The overall results suggest that a program of group meetings with self-monitoring, nutritional information, and encouragement can lead to short-term weight loss, with neither information on reinforcement nor information on stimulus control contributing significantly to the loss. However, the great number of studies showing poor long-term results of weight control programs suggest that results of any weight control program lasting for less than a year should be viewed as tentative. (Author)