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Rather, they constitute one of the sources of uncertainty that affect project risks, and they are essential to consider in project planning. 1-1. 1-1. The processes within each step are discussed in terms of inputs, activities, and outputs. Additional guidance is provided using examples that are relevant to NASA projects. The system design processes are four interdependent, highly iterative and recursive processes, resulting in a validated set of requirements and a validated design solution that satisfies a set of stakeholder expectations.

For large flight projects, there may be an extended period of cruise, orbit insertion, on-orbit assembly, and initial shakedown operations. Near the end of the prime mission, the project may apply for a mission extension to continue mission activities or attempt to perform additional mission objectives. 9 Project Phase F: Closeout During Phase F, activities are performed to implement the systems decommissioning disposal planning and analyze any returned data and samples. The products of the phase are the results of the mission.

Engineering test items may be developed and used to derive data for further design work, and project risks are reduced by successful technology developments and demonstrations. Phase B culminates in a series of PDRs, containing the system-level PDR and PDRs for lower level end items as appropriate. The PDRs reflect the successive refinement of requirements into designs. ) Design issues uncovered in the PDRs should be resolved so that final design can begin with unambiguous design-to specifications.

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