This document provides guidance regarding design considerations, material assessment techniques, and recommendations for material acceptance prior to use in Hybrid / MCM Products. As part of the risk assessment process, both technical requirements and cost should be carefully considered with regard to testing / evaluating the elements of a hybrid microcircuit or Multi-chip Module (MCM) prior to material release for assembly. The intent of this document is to highlight various options that are available to the Hybrid / MCM manufacturer and provide associated guidance, not to impose a specific set of tests.