5 sections 31 to 36 contain narrative descriptions of

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Unformatted text preview: ication of difficult components. Doing things out of their usual sequence increases risk in that those activities could wind up having been either unnecessary or improperly specified. On the other hand, overall risk can sometimes be reduced by removal of such activities from the critical path. Figure 5 (foldout, next page) details the resulting management and major systems engineering products and control gates that characterize the phases in NMI 7120.4 and NHB 7120.5. Sections 3.1 to 3.6 contain narrative descriptions of the purposes, major activities, products, and control gates of the NASA project life cycle phases. Section 3.7 provides a more concentrated discussion of the role of systems engineering in the process. Section 3.8 describes the NASA budget cycle within which program/project managers and system engineers must operate. 3.1 Pre-Phase A—Advanced Studies The purpose of this activity, which is usually performed more or less continually by "Advanced Projects" groups, is to uncover, invent, create, concoct and/or devise NASA Systems Engineering Handbook The Project Life Cycle for Major NASA Systems Pre-Phase A—Advanced Studies Purpose: To produce a broad spectrum of ideas and alternatives for missions from which new programs/projects can be selected. Major Activities and their Products: Identify missions consistent with charter Identify and involve users Perform preliminary evaluations of possible missions Prepare program/project proposals,which include: • Mission justification and objectives • Possible operations concepts • Possible system architectures • Cost, schedule, and risk estimates. Develop master plans for existing program areas Information Baselined: (nothing) Control Gates: Mission Concept Review Informal proposal reviews a broad spectrum of ideas and alternatives for missions from which new projects (programs) can be selected. Typically, this activity consists of loosely structured examinations of new ideas, usually without central control and mostly oriented toward small studies. Its maj...
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