The Modular Infra-Red Target Imaging Model (MIRTIM)is being developed at Rockwell MSD to assist in the design, development, and evaluation of IIR seekers and trackers. The goal of this effort is to produce a computer program that integrates target, weather, engagement, countermeasure, and seeker characteristics, including sensor and optics to determine anticipated seeker performance. The MIRTIM database will include 3-D ground and air target models with surface temperatures generated with the TACOM/KRC code PRISM, GTSIG from the Georgia Tech Research Institute, and Rockwell MSD's own AIRSIG Program. The weather effects database is obtained with the EOSAEL program library from the U.S. Army's Atmospheric Sciences Laboratory. Engagement, countermeasure, and seeker options are concerned primarily with tactical missile applications and focal plane array seekers. The Focal Plane Arrays are those developed by Rockwell International - Science Center, using their own Producible Alternative to Cadium Telluride Epitaxy (PAE) technology. These arrays have been shown to be an effective solution for tactical missile guidance. This modeling technology effort began in FY85.