A system, handheld devices, and methods for object tracking and control. The system tracks and controls items, users, including medical practitioners, patients, and their interactions. The handheld mobile wireless device provides item specific information, instruction, and supervision. A plurality of handheld devices is configured to be used by different users, and communicate with a central database. A handheld device comprises a camera for scanning an image of an object, a display for displaying information, and a wireless network connection to the database server. The system recognizes the object and identifies a person. The database includes information regarding people and their roles, permissions, and authorized or assigned tasks; objects and tools; object specific instructions; and the handheld devices. An observer, or the system, can monitor the performance of the tasks, and provide corrective feedback.