This paper describes an interactive, computer-based Mission Decomposition Tool (MDT) developed as part of the Cockpit Automation Technology Program sponsored by the Air Force System Command's Human Systems Division. The purpose of this tool is to improve the efficiency of the crewstation design process. Specific activities supported by the MDT include generation and decomposition of Air-to-Air and Air-to-Ground mission scenarios; generation of mission event timelines; and post-flight analysis. Mission generation/decomposition involves the laydown of maps, map features (streams, roads, etc.), threats, targets, and waypoints. The mission event timeline is generated automatically when a mission is flown and may be edited to ensure that unique mission activities are included. Post-flight analysis options include plots of threat exposure, terrain masking, terrain following, terrain clearance, discrete mission events, and aircraft performance data. The MDT strengthens the connection between analysis and test and evaluation activities in the areas of mission planning, pilot briefing, simulation set-up, performance assessment, and post-flight analysis.