This AGARDograph addresses simulation and validation techniques for guidance and control systems of tactical guided weapons. Many developments in simulation philosophy, techniques, and facilities have taken place over the last few years. In particular, physical simulation using hybrid, hardware in the loop techniques has assumed much more importance. The chapter on Digital Simulation Techniques provides descriptions of digital simulation techniques for application to some of the more difficult aspects of tactical guided weapon guidance and control systems. Concerning Hardware in the loop (HITL) Simulation Techniques the volume provides information on radar target simulation techniques. The volume concludes with System Simulation and Experience presenting 'lessons learned' type information from some major programs. This section shows the application of above techniques to guided weapon developments: Keywords: Control simulation; Digital simulation; Missile control; Missile guidance; Proving; Radar target position simulators; Test Facilities; Guidance computer; France.