Abacus programming corporation proposes to knowledge engineer and develop a prototype of an interactive expert system to aid in the selection of inertial systems for new and upgraded missile/weapon systems. The expert system will allow a non-specialist user to act as an expert in inertial systems to match mission requirements with inertial hardware capabilities and to evaluate the mission implications of selected systems. The expert system for naval weapons center, china lake, will have "tutorial or help utilities which will guide any scientist, engineer, or technical manager through a session." "for phase l...the database or the rules set must be simple to modify in order to keep it up-to-date and allow for growth." Abacus, a recognized leader in the application of expert system technology and with a corporate expertise in the inertial systems knowledge domain, proposes to develop this prototype expert system with the capability to generate fact sheets in a standard NWC entry/display/hard copy format. The standard format will simplify the interface with vendors and specialists and enable rapid updating of inertial systems facts in the NWC expert system which are essential for the practical utility of this expert system application.