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b. This NPR applies to the complete software development life cycle, including software planning, development, testing, maintenance, retirement, operations, management, acquisition, and assurance activities. The requirements of this directive cover such software created, acquired, or maintained by NASA or for NASA to the extent specified or referenced in an appropriate contract, grant, or cooperative agreement. The applicability of these requirements to specific systems and subsystems within the Agency’s investment areas, programs, and projects is through the use of the NASA-wide definition of software classes, defined in Appendix D. Some projects may contain multiple software systems and software subsystems having different software classes. For this directive, software is defined in Appendix A, and includes software executing on processors embedded in programmable logic devices.
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| title | Figure 1. NASA software classification structure |
NASA-Wide Software Classifications
Class A Human-Rated Space Software Systems
Class B Non-Human Space-Rated Software Systems or Large-Scale Aeronautics Vehicles
Class C Mission Support Software or Aeronautic Vehicles, or Major Engineering/Research Facility Software
Class D Basic Science/Engineering Design and Research and Technology Software
Class E Design Concept, Research, Technology, and General Purpose Software
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c. For existing Class A through E programs and projects, the software engineering requirements of this NPR apply to their current and future phases as determined by the responsible Mission Directorate as approved by the NASA Chief Engineer (or as delegated).
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