The purpose of this thesis is to investigate the predictive validity of the 1974-1975 Aeronautical Systems Division (ASD) Management Assessment Center conducted at Wright-Patterson AFB OH. The assessment center method is reviewed with an emphasis on the 1974-1975 ASD assessment center background, construction, and usage. As an adjunct to the understanding of assessment centers, predictors, criteria, and the predictive validity concept are reviewed. A previous study of the predictive validity conducted in 1980 concluded that the ASD assessment center is a valid predictor of managerial effectiveness. Although the results of the 1980 study were statistically significant, they did not achieve expected validity levels. Based on those results and a review of criteria, alternate criteria were developed for the measurement of managerial effectiveness. These criteria were incorporated into an interview and questionnaire which were given to the supervisors of a sample group of individuals who participated in the ASD assessment center. Using the information from these interview/questionnaires, a predictive validity study was conducted. Results of this study do not support the 1980 study nor do they confirm the predictive validity of the assessment center. Based on these results, additional research on this subject is recommended. (Author).