The Science Lab Module of Space Station will afford an unparalelled opportunity for scientific research in space. The module and its interfaces are designed to minimize complexity and maximize User accommodations. Facilities will be provided for Life Science research, control of external payloads, servicing of customer equipment and general science investigations. For the first time in the history of the Space Program it is planned to have the ability to diagnose, service and replace equipment while on-orbit. The SLM will have significant operational advantages over previous spacecraft in terms of available volume, power and crew interactions.