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Once a product assessment has shown the design, materials, and evaluated performance characteristics of the optoelectronic device selected are adequate for the intended application(s), measures need to be in place to ensure continued product performance and design integrity for future procurements.  This can be a formal contract requiring notification of changes in design or materials between procurements.  It may refer only to changes that are significant to the intended application, and would probably include configuration changes that may require a change in the “next-assembly” procedures.