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This paper presents a BIST methodology for CMOSgate-arrays. This BIST method involves the extension of a design-independent embedded grid-based test technology that is provided in the base of the gate array to provide an automatic and complete serf-test. The use of globally shared test electronics minimizes the area overhead required, while the massive observability of internal circuit nodes afforded by an embedded grid allows high fault coverage of both stuck-at and manufacturing defects, such as shorts and opens, to be achieved.