In semiconductor industry, reliability audit program (RAP) or reliability
monitoring is very essential to guarantee the product's reliability
performance in a continsouly manner. My company definitely has such system
in place. However my question is we do not have a statistically sound base
on how many or how frequent should we pull the product samples for
performing various kinds of reliability testings. Is it possible to do so?
How? As you know, RAP is a kind of appraisal cost in COQ, how can we
justify between cost and confidence level? Do your companies face same kind
of issues?

Best regards,
Carson Ho

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