See section 49 phase c culminates in a series of

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Unformatted text preview: grated into the design, and the manufacturing process and controls are defined and validated. Configuration management continues to track and control design changes as detailed interfaces are defined. At each step in the successive refinement of the final design, corresponding integration and verification activities are planned in greater detail. During this phase, technical parameters, schedules, and budgets are closely tracked to ensure that undesirable trends (such as an unexpected growth in spacecraft mass or increase in its cost) are recognized early enough to take corrective action. (See Section 4.9.) Phase C culminates in a series of critical design reviews (CDRs) containing the system-level CDR and CDRs corresponding to the different levels of the system hierarchy. The CDR is held prior to the start of fabrication/production of end items for hardware and prior to the start of coding of deliverable software products. Typically, the sequence of CDRs reflects the integration process that will occur in the next phase— that is, from lower-level CDRs to the system-level CDR. Projects, however, should tailor the sequencing of the reviews to meet their individual needs. The final product of this phase is a "build-to" baseline in sufficient detail that actual production can proceed. NASA Systems Engineering Handbook The Project Life Cycle for Major NASA Systems Phase C—Design Purpose: To complete the detailed design of the system (and its associated subsystems, including its operations systems). Major Activities and their Products: Add remaining lower-level design specificationsto the system architecture Refine requirements documents Refine verification plans Prepare interface documents (Repeat the process of successive refinement to get "build-to" specifications and drawings, verification plans, and interface documents at all levels) Augment baselined documents to reflect the growing maturity of the system: system architecture, verification requirements matrix, work breakdown structure, project plans...
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