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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
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
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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