 The SAFTE simulation has received a broad scientific review and the DoD considers it a complete, accurate, and operationally practical model to aid operator scheduling.The SAFTE simulation's software implementation and applicabilities have since been validated in both aviation and railroad work environments.During the Phase 2 effort, the model was refined with findings from AF research and other studies providing a blood alcohol index, lapse index, sleep timing algorithm, and interface features (performance variation percentiles, mission timeline, grid input, and fatigue factors dashboard, to name a few).