Augmented Reality for Maintenance and Repair (ARMAR) explores the use of augmented reality to aid in the execution of procedural tasks in the maintenance and repair domain. The principal research objective of this project is to determine how real time computer graphics, overlaid on and registered with the actual repaired equipment, can improve the productivity, accuracy, and safety of maintenance personnel. Head-worn, motion-tracked displays augment the user’s physical view of the system with information such as sub-component labeling, guided maintenance steps, real time diagnostic data, and safety warnings. The virtualization of the user and maintenance environment allows off-site collaborators to monitor and assist with repairs. Additionally, the integration of real-world knowledge bases with detailed 3D models provides opportunities to use the system as a maintenance simulator/training tool. This project features the design and implementation of prototypes integrating the very latest in motion tracking, mobile computing, wireless networking, 3D modeling, and human-machine interface technologies.