This study provides empirical validation for Roe's system of classification of occupations by comparing descriptions within that system with descriptions given by immediate supervisors through the Minnesota Job Description Questionnaire (MJDQ). The MJDQ yields Occupational Reinforcer Pattern (ORP) depicting relative magnitudes of 21 reinforcers for each of the 81 occupations surveyed. One-way analysis of variance tested the hypothesis that different mean ORP values would be found for occupations grouped at the six different levels of Roe's classification. Statistically significant differences were found on 15 ORP variables within four levels. Workers at higher levels scored higher in Responsibility, Creativity, Antonomy, Authority, as well as in Achievement, Ability, Utilization, Social Status, and lower in Supervision-Technical. More reinforcers were found to be available to higher level occupations, and these reinforcers were primarily intrinsic. Extrinsic reinforcers showed no significant differences between levels. (BP)