The object of this program was to develop and evaluate an improved portable video system for use as an instructional software design tool. The product developed was a basic configuration of half-inch video equipment using a three-camera system augmented with battery-powered recorder cameras. The combined hardware and manuals allowed the researcher to interact with the material being developed with a minimum of interference from photo-electronic operations. This project demonstrated that it is practical for writers to use sophisticated and complex half-inch video systems to facilitate the development of instructional materials. The usability, reliability, and maintainability is adequate to enable a researcher who is not a trained electronic or photographic technician to use the equipment without undue curtailment or restrictions imposed by the electronics and media production techniques involved. This maximizes the attention to content and instructional methodology and facilitates revision based on initial tryout of prototypic instructional sequences. The material in this volume summarizes the method of selection developed and the evaluative procedures employed. (JK)