Tactical decision making teams in the modern warfare environment are faced with situations characterized by rapidly unfolding events, multiple plausible hypotheses, high information ambiguity, severe time pressure, and severe consequences for errors. Training interventions should fully exploit instructional designs that will enable teams to maintain performance under these stressful conditions. Recent research indicates that training scenarios should incorporate significant task situations (events) that present opportunities to learn and achieve desired performance requirements. In addition, the event-based approach allows for standardized, reliable, and valid measurement of team member performance. However, little guidance exists regarding how training scenarios should be designed so that they will have a significant impact on helping the team maintain performance under stressful conditions. Therefore, the purpose of this paper is threefold. First, a stress assessment methodology (SAM) will be described that guide in the creation of structured training scenarios so that they contain appropriate and relevant levels of situational stressors. The SAM is based on the idea that training scenario design should be driven by an identified standard of performance. Therefore, two evaluation instruments will be described, the Behavior Observation Booklet (BOB) and the Sequenced Actions and Latencies Index (SALI), whereby an assessment of team member performance is obtained at pre-specified, time-tagged events in the training scenario. Lastly, implications for creating event-based training scenarios are discussed.