Aircrew coordination training (ACT) has become an important training objective in aviation. Recent ACT training approaches have included behaviorally-based training objectives in the realization that, like other aviation skills, the acquisition of aircrew coordination skills is reinforced through practice and feedback. However, there is little in the way of guidelines for the conduct and debriefing of aircrew team training exercises beyond global ratings of performance. The purpose of this paper is to discuss an aircrew coordination performance measurement methodology which, originally developed for team research, has direct application to the training and debriefing of aircrews as well as other types of teams (e.g., CIC). The methodology is a form of structured observation in which (1) opportunities for crews to demonstrate aircrew coordination skills in training scenarios are provided utilizing carefully structured scenario events, (2) acceptable crew responses to each of the events are determined a priori by utilizing NATOPS, SOPs and subject matter experts (i.e., military aircrews), and (3) appropriate responses to events are scored as either present or absent. The strength of this approach is that it is operationally relevant, minimizes judgements required by observers, and permits observation of crews across a wide variety of specific aircrew coordination behaviors. In research contexts, high inter-observer reliability is achieved and the measures appear to be sensitive to the effects of ACT. In the context of training, these characteristics should (1) enable instructors to provide specific and meaningful feedback with regard to the strengths and weaknesses of aircrew team performance (i.e., it is diagnostic), (2) facilitate standardization of observation and feedback by instructors, and (3) enable the technique to be implemented with minimal instructor training. Applications of the technique to other team training domains are discussed.