ON-LINE CONFIGURATION MANAGEMENT: Configuration Management is covered in many books and articles and is described in detail for development and test of systems which are either all software or all hardware. In real time simulation which involves integrated and, many times, interactive hardware and software, plus human interaction with instructor and/or students, a new level of control is required called hardware software integration/test. In addition, subjective customer evaluation and acceptance may extend this period indefinitely. This period of test and evaluation could result in elapsed time of half the project schedule and is usually where all the budgets/schedules go down the tubes. This paper describes an approach to on-line system configuration management, starting with a prototype baseline system ready for hardware software integration.