The management development program (MDP) at the University of Tulsa provides an opportunity for identification and development of managerial skills among administrators in the elementary and secondary schools of northeastern Oklahoma. The validity of assessment center exercises for predicting performance as a school principal was examined by a concurrent strategy that involved determining the relationship between principals' performance on the assessment predictors and superintendents' evaluations of those same incumbent principals. A subset of assessment exercises and personality inventories comprised the final predictor battery, which can be used as a selection device to predict superintendents' rating of principals' job performance. (TE)