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Designed study to determine the "active ingredients" in Lewinsohn's behavioral treatment for depression. Fifty-six men and women were screened for significant depression and were assigned to four experimental treatment groups: (1) an activities-increase group instructed to increment participation in reinforcing activities; (2) an expectancy-control group that participated in a fitness program; (3) a self-monitoring control that simply recorded activities and mood daily; and (4) an attention-control group. Consistent with an operant model of depression, the resulted indicated that increases in activities that Ss had rated as pleasureable alleviated depressed mood over a 30--day time period. While all Ss evidenced some improvement in mood, the activities-increase group showed significantly greater improvement than Ss in groups that did not increase their activity levels. Correlational analyses of daily activity and Depression Adjective Check List Scores proved additional support for the behavioral model of depression. The outcome for the four experimental groups was not different on a measure of belief in internal vs. external control of reinforcement.

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