Abstract : Two experiments were conducted to evaluate the impact of a domain-specific digital whiteboard tool and a tactical resource management display on team performance efficiency in a simulated command and control (C2) air defense scenario. The two experiments differed primarily in the participant population employed - in the first experiment novices (college students) with no C2 experience served as participants, and in the second experienced domain experts were the participants. During the experiment participants assumed the roles of weapons directors responsible for coordinating offensive counter-air, defensive counter-air, and air refueling with their teammates. The results of both experiments suggest that the collaboration technologies examined are likely to reduce reliance on radio communication without adversely affecting team performance, and under some circumstances they may provide small performance gains.