This dissertation by Donald Winslow Fiske, submitted in 1948 as part of his doctoral studies at the University of Michigan, explores the consistency of factorial structures in personality ratings from different sources. The study uses a population of 126 men who participated in a clinical psychology training program, with ratings from staff, teammates, and self-ratings. The data is analyzed using Thurstone's methods, and the results are compared to identify recurrent factors. The primary factors identified include: 1. **Social Adaptability**: Traits such as cheerful, talkative, adventurous, adaptable, and placid. 2. **Emotional Control**: Traits like unshakeable, self-sufficient, placid, and limited overt emotional expression. 3. **Conformity**: Traits such as ready to cooperate, serious, trustful, good-natured, easy going, and conscientious. 4. **The Searching Intellect**: Traits like broad interests, independent-minded, imaginative, and social poise. 5. **Confident Self-Expression**: Traits such as assertive, talkative, marked interest in women, and frank, expressive. The dissertation also discusses the comparison of these findings with those of Cattell, noting similarities and discrepancies in the factors identified. It highlights the importance of factor analysis in reducing the complexity of personality data and identifying core dimensions. The study concludes with a discussion of the generality of the findings and suggestions for future research.This dissertation by Donald Winslow Fiske, submitted in 1948 as part of his doctoral studies at the University of Michigan, explores the consistency of factorial structures in personality ratings from different sources. The study uses a population of 126 men who participated in a clinical psychology training program, with ratings from staff, teammates, and self-ratings. The data is analyzed using Thurstone's methods, and the results are compared to identify recurrent factors. The primary factors identified include: 1. **Social Adaptability**: Traits such as cheerful, talkative, adventurous, adaptable, and placid. 2. **Emotional Control**: Traits like unshakeable, self-sufficient, placid, and limited overt emotional expression. 3. **Conformity**: Traits such as ready to cooperate, serious, trustful, good-natured, easy going, and conscientious. 4. **The Searching Intellect**: Traits like broad interests, independent-minded, imaginative, and social poise. 5. **Confident Self-Expression**: Traits such as assertive, talkative, marked interest in women, and frank, expressive. The dissertation also discusses the comparison of these findings with those of Cattell, noting similarities and discrepancies in the factors identified. It highlights the importance of factor analysis in reducing the complexity of personality data and identifying core dimensions. The study concludes with a discussion of the generality of the findings and suggestions for future research.