In response to a need for refined methods of appraising the potential of prospective Manpower Development and Training Act (MDTA) trainees, this study was conducted to determine if descriptive data about trainees being gathered by the employment service, such as personal information and General Aptitude Test Battery scores, are effective predictors of success in MDTA program. An attempt was also made at isolating attitudes and skill development during the training program which might be related to success in the occupation. The sample consisted of all trainees on whom there were complete data (138) enrolled in 10 purposively selected MDTA projects in Minnesota to represent technician, sales and clerical, and skilled training programs. Multiple regression equations were developed for each group using 22 personal and training related variables and 15 in-school instructor rating variables. Each equation predicted the criterion (post-training employment status) above the .01 level of significance for their respective groups. However, no equation was developed that predicted well in all of the three groups. The findings imply systematic differences between persons who succeed and those who do not. An investigation of relationships between variables on which the employment service is currently gathering data might be used to develop weighted combinations of variables to form improved criteria. (HC)