The pleasant events schedule: Studies on reliability, validity, and scale intercorrelation.

Convergent and discriminant validation by the multitrait-multimethod matrix.

Donald T. Campbell, Donald W. Fiske · Psychological Bulletin · 1959 · 17.1K citations · Full text

Social Sciences, Educational Assessment, Educational Measurement +6

Pleasant activities and depression.

Peter M. Lewinsohn, Michael Gräf · Journal of Consulting and Clinical Psychology · 1973 · 538 citations

Social Sciences, Behavioral Sciences, Psychology +10

Pleasant events, activity schedules, and depressions.

Peter M. Lewinsohn, Julian Libet · Journal of Abnormal Psychology · 1972 · 364 citations

Social Sciences, Behavioral Sciences, Psychology +11

Nonspecific improvement effects in depression using interpersonal skills training, pleasant activity schedules, or cognitive training.

Antonette M. Zeiss, Peter M. Lewinsohn, Ricardo F. Mu oz · Journal of Consulting and Clinical Psychology · 1979 · 335 citations

Social Sciences, Psychiatry, Psychology +17

Changing reinforcing events: An approach to the treatment of depression.

Peter M. Lewinsohn, J. Michael Sullivan, Sally J. Grosscup · Psychotherapy · 1980 · 225 citations

Social Sciences, Psychiatry, Psychology +10