The Design of Training Systems (DOTS) project was initiated by the Department of Defense to develop tools for the effective management of military training organizations. Phase 2 of the project, from which this report emanates, involved the design and development of three computer-based mathematical models and their validation. Volume 1 presents an overview of the activities that comprised the design and development effort for the three DOTS models, a description of the validation process, and the long-range implications of the development of an operational system of DOTS models. Included in the volume are descriptions of the three models developed, their hardware and software requirements, and some of the organizational implications flowing from their implementation. (DGC)