Abstract: A multi-function information system utilizing a specialized modular information library is disclosed. In its preferred embodiment, the system is applied to the problem of teaching technicians the theory of specific apparatus and providing a tool to aid in the location and correction of malfunctions of the apparatus. In such an application, the system may comprise a video playback system and a video-cassette library containing a description of how the apparatus operates and malfunction correction procedures. Special procedures are employed in constructing the library to assure that the teaching and malfunction correction times are minimized.