Distributed team training, often in joint settings, is becoming more and more important in military training today. Performance measurement and feedback are crucial for effective team training. To support observers during distributed team training the Mobile tool for Performance measurement and Evaluation during Distributed team training (MOPED) was developed. This handheld device can help the observer to evaluate targeted behaviors that are vital for local and distributed team performance. It also enables the observer to quickly generate an after action review (AAR). MOPED is currently being tested at the Royal Netherlands Navy. Because of the importance of the AAR for learning by teams, more research is being done on supporting observers and evaluators in providing a comprehensive and to-the-point AAR in a relatively short timeframe.