- Male college students, followed 3 years, Harvard University, USA, 1957-60
- N = 17
- Non Response:
- 37%: 9 dropouts, incomplete; about the same happiness distribution.
Multiple asesment methods
Mood diary kept 30 days and repeated interviews and tests during three years.
- Authors's label
- Length of time span
- Our Classification
- Score obtained from a set of 30 stories using Thematic Apperception Test cards (see Ricks & Epley, 1960).