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NASA GPR 7120.5

Revision A, January 10, 2005

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Product Details:

  • Revision: Revision A, January 10, 2005
  • Published Date: January 10, 2005
  • Status: Active, Most Current
  • Document Language: English
  • Published By: National Air and Space Administration (NASA)
  • Page Count: 38
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This directive outlines a process for the systems engineering of Goddard Space Flight Center (GSFC) Missions. The intent is to outline a set of requirements that provide a consistent method for performing systems engineering across GSFC projects. The requirements for system engineering outlined in this directive are universal principles that, when followed, should result in sound systems.

This directive defines the minimum set of systems engineering functions for GSFC Missions. These functions, from a product perspective, are defined and described. All phases of the mission lifecycle, and systems of interest, from mission, through major system element, to subsystem, to component or assembly are considered. The system engineering functions described in this directive are universal and generally apply across the board. What varies from project to project is who does them, to what degree they are performed, and to what degree there is insight by the customer as to how the functions are accomplished.

This directive is concerned with what must be done, along with insight into why it is done, rather than how it is done. The referenced SP-6105 provides detailed guidance on how to perform systems engineering functions. The required functions are described by shall statements. Tailoring of how, when, where, and by whom these functions are performed is described in a project unique Systems Engineering Management Plan (SEMP). An example of a SEMP outline is listed in Appendix B.

Principles for tailoring systems engineering activities are listed in Appendix C. The tailoring guidelines address who performs the functions and to what degree the functions are performed.

This directive defines systems engineering terminology (Section P.10). Roles and Responsibilities (Section 1) and the systems engineering lifecycle (Section 2) are defined. Communications and the systems engineering team (Section 3) are discussed. Systems engineering functions and products, and critical function flow and process operations, are discussed in Section 4. Section 5 discusses Configuration Management and Documentation. The required plan for systems engineering implementation is given in section 6. Appendix A contains a list of the systems engineering requirements defined within this directive. It may be used as a sample validation matrix.

APPLICABILITY. This systems engineering procedure shall be tailored and applied to all missions (e.g., projects) for which GSFC is responsible, as well as to deliverable instruments, spacecraft and other GSFC mission products. This procedure applies to all concept studies, mission formulation, and implementation subprocesses, including mission operations, decommissioning and disposal.