This paper presents a cost-based assessment of the effectiveness of Sm
art Substrate MCM Systems. A Smart Substrate MCM System is one in whic
h the substrate contains active circuitry for carrying out testing fun
ctions, The feasibility of using this approach is investigated. The Sm
art Substrate strategy is compared to an alternative approach based on
the assumption that system components are perfect (''Known Good Die (
KGD)'' approach). The obtained results identify the domain of applicab
ility of Smart substrate MCMs and point to limitations of the KGD appr
oach.