Previous research exploring the assumptions of process invariance (Walker, 1989) found discrepancies between process and rating outcomes when rater and ratee populations were crossed. Divergent results were attributed to differences in the ratee stimulus performance tapes. The present study attempted to explore how levels of task complexity would moderate the relationship between job knowledge and both information processing and rating accuracy. 123 male subjects were measured on their knowledge of football, and viewed the performance of either offensive tackles (complex task) or running backs (simple task) under directions to either form an impression or remember as much detail as possible. It was expected that observational purpose would moderate the type of information recalled, rating accuracy, and accuracy in recording behavior frequencies in the complex task condition only. Results supported hypotheses only for Cronbaoh-. (19S5) elevation measure pertaining to behavior frequency ratings, and consistent task complexity main effects among accuracy measures for behavior frequency ratings. Some possible limitations and explanations for the present results and some implications for future research are offered. / Ph. D.