||MIL-HDBK-470A: Designing and Developing Maintainable Products and Systems
SECTION C - GUIDANCE FOR SELECTING SOURCES
The maintainability portion of a bidder's proposal can be evaluated using the criteria in Figure A-3. In addition to the criteria listed in the figure, the customer should encourage and look for
innovative approaches that achieve the maintainability performance requirements in the most effective way. Also, the proposal should emphasize the following objectives:
- Understand the Customer's Maintainability Needs -if the customer has not explicitly done so, determine the required level of maintainability as measured by the user during actual use of the product. No matter the source of the requirement, determine the feasibility of achieving the required maintainability and track progress toward that achievement.
- Thoroughly Understand the Design -understand the maintainability of the design and the maintenance required for the product.
- Integrate Maintainability with the Systems Engineering Process -make the maintainability activities conducted during design and manufacturing an integral part of the product and processes design effort. Ensure all sources (i.e., suppliers, vendors, etc.) of components, materials, etc. used in the product, design and manufacture those components and materials in accordance with the
- Design for Desired Level of Maintainability -use proven design approaches to make needed maintenance safe, economical, and easy to perform.
- Validate the Maintainability Through Analysis and Development Test -conduct analyses, simulation, and testing to uncover maintainability problems, revise the design, and validate the effectiveness of the redesign.
- Monitor and Analyze Operational Performance -assess the operational maintainability of the product in actual use to uncover problems, identify needed improvements, and provide "Lessons Learned" for incorporation in handbooks and for refining modeling and analysis methods.
Figure A-3 - Checklist for Evaluating Maintainability Portion of a Proposal
NOTE: The following list is not all-inclusive and not all
items necessarily apply to every program
Does the proposal show a clear
the importance of designing in maintainability?
maintainability techniques, methodology, and
the role of testability and diagnostics in
maintainability and maintenance?
integrated diagnostics design principles?
the importance of integrating
maintainability activities into the overall systems engineering
Management. Does the proposal
- who is
responsible for maintainability and his/her experience and
the number and experience of maintainability personnel assigned to the
program and the level of effort allocated to maintainability
maintainability personnel fit in the program's organizational
effective means of communication and sharing of information among
maintainability engineers and analysts, design engineers, manufacturing
engineers, and higher management?
- how the testability and diagnostics functions are
integrated into the maintainability
- the suppliers' system for controlling the
maintainability of items from other suppliers & vendors?
how the supplier implements concurrent engineering practices and
integrates maintainability into the overall engineering and
Design. Does the proposal
- if and how design standards, guidelines,
and criteria will be used?
- the approach to designing for testability
- if and how tradeoff studies will be used for
critical design areas?
- the time-phasing of maintainability activities
in relation to key program milestones?
- any areas of maintainability
if and how software maintainability will be addressed?
Does the proposal identify and
- methods of analysis and math models to be used?
maintainability modeling, prediction, and allocation procedures?
time phasing of any proposed maintainability testing in relation to the
overall program schedule?
- the time available for the test type
required (such as maximum time for maintainability demonstration) and how
that time was determined?
- if and how the supplier will predict the
maintainability (in whatever parameters are specified) prior to the start
resources (test chambers, special equipment, etc.) needed to perform all
required testing, how they were determined, and their availability?
- how the results of all testing will be used to
evaluate maintainability and identify maintainability
Design. The proposal should include:
of compliance with military and commercial specifications and standards,
when required, and good engineering practices for maintainability.
evidence that ease of maintenance and preventive maintenance requirements
will be addressed.
justification (models, preliminary estimates, data sources, etc.) to
back up the claims of meeting maintainability requirements.
The proposal should indicate:
Data. The proposal should show an
explicit commitment to deliver all required maintainability data items
in the format specified.
explicit commitment to perform all maintainability analyses cited in the
proposal or required by contract.
- an explicit commitment to perform
all maintainability testing cited in the proposal or required by
- that the supplier complies with all product-level
maintainability test requirements and that the contractor will demonstrate
the maintainability figures of merit by test using any specified
accept/reject criteria or by analysis.
- if and how the contractor will perform
verification or demonstration testing, the type of testing planned, and
the specific purpose of the testing.