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 ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################