Objective psychological measures, personal historical data, and seven criterion measures of performance were made on 67 physician extenders (MEDEX) in five consecutive classes at a southeastern university training site over a two year period, October 1972-April 1975. Multiple regression analysis was used to identify significant predictors for each of the seven areas of the program evaluated by a grade point average. The predictors varied depending on whether assessment was directed toward academic, psychomotor, or interpersonal skills. These findings suggest that certain psychological measures and personal historical data are important to consider when admitting or counseling students considering technically based physician extender training programs. (Author)