Litton Industries has been investigating methods for analyzing training problems and designing appropriate systems of individualized instruction to address those problems. This work can be referred to as the development of the Instructional Systems Analysis and Selection (ISAS) procedures. ISAS is a collection of questions, comparison matrices, guidelines, and suggestions designed to assist in the analysis of an instructional or training problem. The objectives of the analysis are to choose an instructional systems model that best fits the training need and to develop the highest quality and most cost-effective instructional materials possible within that model. An instructional model is a description of the overall system for delivering instruction. It describes the flow of trainees through the system, indicates the important decision points, and makes it possible to predict how the system will behave under different conditions. Several possible models are proposed and discussed in this paper. (KC)