Abstract: Methods and systems are provided for an interactive electronic technical manual system. A system includes a user interface for receiving input from a user and providing output to the user. A database stores instructions associated with tasks. The system also includes a diagnostic reasoner for receiving commands, controlling an external device in response to the commands to implement a test of the external device, and sensing signals associated with the test of the external device. The system further includes an interface module in communication with the user interface, the database, and the diagnostic reasoner. The interface module sends instructions associated with tasks to the user interface from the database, conveys commands from the user interface to the diagnostic reasoner, receives data associated with the signals sensed by the diagnostic reasoner, and analyzes the data associated with the signals.