This project expanded and evaluated the performance evaluation method developed by Sollenberger, Stein, and Gromelski (1997), a Terminal Radar Approach Control rating form and training package designed to better assess air traffic controller performance. The form is a research-oriented testing and assessment tool designed to measure the efficacy of new air traffic control (ATC) systems, system enhancements, and operational procedures in simulation research. The rating form used in the present study focused on observable behaviors that supervisory air traffic control specialists (SATCSs) use to make behaviorally based ratings of en route controller performance. The present study evaluated the inter-rater and intra-rater reliability of perfor...