• configuration management and control (including Tier 1 Change Control Board)

  • mission assurance and safety including Tier 1 failure mode and effects analysis (FMEA)

  • Tier 1 risk analysis and risk reduction programs

  • maintenance and rebalancing of the efforts listed above as required

Completing these tasks will require at least the following inputs:

  • Project Constellation vision

  • Project Constellation top-level requirements (system of systems)

  • preliminary system-of-systems architectures developed by NASA

  • preliminary program approach and phasing developed by NASA

TIER 2: SYSTEMS

At Tier 2, the systems integrator would accomplish tasks such as the following:

  • refinement of Tier 2 performance requirements

  • drafting of verification and validation requirements and plans for Tier 2 requirements

  • completion of architectural trade studies leading to refined architectures for each Tier 2 system (Tier 2 expansions of Tier 1 architectural products)

  • definition of other Tier 2 level requirements, such as redundancy, reliability, and availability

  • flowdown of Tier 2 performance requirements to Tier 3 (Segment), such as the following in the crew transport system:

    • crew exploration vehicle

    • launch vehicle

    • extravehicular activity systems

    • intravehicular activity systems

    • in-space transport systems

  • development of interface specifications for Tier 3 systems

  • drafting of verification and validation requirements and plans for Tier 3 requirements

  • refinement of program approach and phasing for Tier 2

  • establishment, operation, and support of other critical systems-integration functions, such as:

    • configuration management and control (including Tier 2 Change Control Board)

    • mission assurance and safety, including Tier 2 FMEA

    • Tier 2 risk analysis and risk reduction programs

  • maintenance and rebalancing of the efforts listed above as required

Completing these tasks will require at least the following inputs:

  • Tier 1 outputs

  • Tier 2 program constraints from NASA



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