This report describes the development of the Instructional Support System (ISS), a large-scale, computer-based training system that supports both computer-assisted instruction and computer-managed instruction. Written in the Ada programming language, the ISS software package is designed to be machine independent. It is also grouped into functional modules so that each module can be executed individually or combined as needed to support operational requirements. The ISS is not designed for any particular machine or operation system, and it can run on computer systems ranging from small microcomputers to mini- and mainframe computers. This report provides a description of the project and discusses: (1) the project's major accomplishments; (2) the application support environment; (3) software portability; (4) system requirements, including the Ada programming language, host operating system, hardware, process/peripheral, and display station; and (5) ISS potential for training purposes. Guidelines are also presented for implementing the ISS software on a microcomputer. Conclusions and recommendations are provided. (JB)