Begin with an engineering-approved, serviceable product family and define the incoming core ranges the process is allowed to accept. Map each operation, equipment item, fixture, material, work instruction, inspection and hold point. Run documented challenge builds across relevant core conditions and approved variants, preserving actual parameters, measurements, failures, rework and dispositions. Evaluate whether controls prevent or detect the identified failure modes; do not replace this review with a single yield or pass-rate claim. Approve the exact configuration tested, train authorized personnel, and require change review and revalidation when the product, core source, component, tool, method, software or acceptance rule changes.