In recent years, the National Highvay Traffic Safety Administration's (NHTSA) office of research and development has increased its use of computer models in lieu of building and testing hardware. such as experimental vehicles. Consequently, considerable effort has been expended in developing, improving, and using occupant and vehicle models and the data needed to use the models. Many of these models, which were dweloped with public funds, are available for use by the public, including the safety community. The paper describes the models in current use at NHTSA, summarizes published applications, and specifies the models and data which are available. A suggestion is made that international cooperation on the development and application of models would further the objectives of the International Experimental Safety Vehicles (ESV) Program. while saving resources for all.