||NAVSO P-3641A: More Power For The Dollar
3.2.3 Design Reviews
Design reviews are a powerful tool that can be
used to help manage technical risk. These reviews allow program managers
to maintain visibility of the status and progress of the power supply
development activity in meeting the requirements and to initiate coffective
action if warranted. For COTS/NDI, an understanding of the power supply
vendor's development processes provides insight into the design and its
technical acceptability. Appendix
, Modified COTS/NDI and Custom Power Supply
Supplier Evaluation, provides a means of evaluating a potential power supply
For Modified COTS/NDI and Custom
power supplies, design reviewers should consider Design Review Checklists for
Power Systems and Power Supplies contained in Appendix
. The following best practices should be
followed for effective design reviews:
- Include funding for design reviews in the program budget.
- Assign expert technical personnel independent from the specific hardware
- Perform design reviews after the completion of the power supply
development sch milestones. A reasonable degree of flexibility in
scheduling should be provided s the activities associated with the
milestones are indeed completed.
- Have an effective, detailed agenda. The agenda should be generated
and agreed u the procuring agency and the power supply developer well in
advance of the desi review. The agenda should delineate very clearly
the items to be covered and sho include the forrnat in which the information
will be presented.
- Provide a design review package to the procuring agency in sufficient
time prior to review so that the members of the review team can be prepared.
The following provides a brief description of typical
reviews conducted during the design process.
The purpose of a conceptual design review (equivalent to a Systems
Design Review for a major weapon system) is to ensure that there is agreement
on the power supply specification, that all questions have been answered and
that the development plan as well as the overall design concept is understood
by all. Those actions that must be completed prior to a Conceptual
Design Review are:
- Proposed performance specification.
- Design concept in block diagram form with written description provided
to reviewers prior to meeting. This includes electrical, mechanical,
and thermal considerations.
- Draft development milestone chart.
primary objective of the Preliminary Design Review (PDR) should be to evaluate
the progress of the preliminary design and its compliance with the specified
requirements. See the Appendix
B Checklists for specific guidelines
Critical Design Review
primary objective of the Critical Design Review (CDR) is to determine that the
power supply is properly designed and ready for release for
manufacturing. All actions from the PDR should have been closed prior to
CDR. See the Appendix
for specific guidelines.
Production Readiness Review
Production Readiness Review (PRR) is not actually a design review, it is
included because producibility of the design is a major concern. The
prime objective of the PRR is to evaluate the adequacy of the processes,
procedures, tools and training which apply to manufacturing the power
supply. The activities and/or milestones that should be addressed
include, but are not necessarily limited to:
- All action items from the CDR should be closed.
- Manufacturing documentation (e.g., machining and assembly drawings and
travelers) is complete.
- Tool design (e.g., assembly fixtures and wire harness mockups) is
- Quality assurance provisions are documented.
- Test procedures (e.g., in process procedures for subassemblies and final
test) are complete.
- Processes (e.g., workflow, conformal coating of boards, in-process
inspection) are in place.
- Plans for environmental stress screening are complete.
- Plans for training power supply production personnel are in place.