The Level I requirements for an OSP system were developed based on NASA's missions, as defined in the Integrated Space Transportation Plan, input from industry and Department of Defense partners participating in the program. The requirements were reviewed at multiple levels within NASA. The final review and approval process included the NASA Administrator, Deputy Administrator, Associate Administrator for the Office of Aerospace Technology, and the Associate Administrator, Office of Space Flight.
"This is an important first step in making the Integrated Space Transportation Plan a reality," said NASA Deputy Administrator Frederick Gregory. "The Orbital Space Plane system will give us the flexibility needed to safely and efficiently get crew to and from orbit and to provide crew rescue and logistical support to the International Space Station. These initial requirements help to outline a comprehensive system that will significantly complement the capabilities of our existing Space Shuttle fleet," he said.
Any future changes to the Level I Requirements would be considered by the Orbital Space Plane Program Office and require approval from the NASA Executive Council.
The program is in the process of developing Level II Requirements for the OSP system. Unlike the Level I requirements, which were defined by NASA, Level II requirements will be defined at the program level and will be detailed in a document referred to as the Systems Requirements Document (SRD) planned for release no later than late 2003.
The requirements are available on the Internet at: http://www.slinews.com/ospreq1.html