Large-scale computer models of intentions have the potential to play a significant role in the coordination of large, complex macro-systems. By representing the intentions of all participants in a unified, dynamic, real-time computer model, participants can detect conflicts between their activities and those of others. In a cooperating macro-system, participants can improve overall performance by adapting their activities to reduce conflict and enhance cooperation. In adversarial macro-systems, such as military combat, tracking the intentions of friendly and hostile forces can provide enhanced counter- planning and response execution. This paper provides a brief view of the current progress in constructing and testing large scale models of intent based on recent manned simulation experiments and demonstrations.