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Unformatted text preview: active approved baseline is communicated in a
timely manner to all those relying on it. This
communication keeps project teams apprised as to the
distinction between what is frozen under formal change
control and what can still be decided without
configuration control board approval.
Configuration control is essential at both the
contractor and NASA field center levels. Changes
determined to be Class I to the contractor must be
referred to the NASA project manager for resolution.
This process is described in Figure 19. The use of a
preliminary Engineering Change Proposal (ECP) to
forewarn of an impending change provides the project
manager with sufficient preliminary information to
determine whether the contractor should spend NASA
contract funds on a formal ECP. This technique is
designed to save significant contract dollars. Class 1 changes affect the approved baseline
and hence the product version identification. Class 2
changes are editorial changes or internal changes not
"visible" to the external interfaces. Class 2 changes are
dispositioned by the contractor's CCB and do not require
the NASA project manager's approval.
Overly formalized systems can become so
burdensome that members of the project team may try
to circumvent the process. It is essential that the
formality of the change process be appropriately tailored
to the needs of each project. However, there must
always be effective configuration control on every
For software projects, it is routine to use version
control for both pre-release and post-release deliverable
systems. It is equally important to maintain version confor hardware-only systems.
Approved changes on a development project
that has only one deliverable obviously are only
applicable to that one deliverable item. However, for
projects that have multiple deliverables of "identical"
design, changes may become effective on the second or
subsequent production articles. In such a situation, the
configuration control board must decide the effectivity of
the change, and...
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