Hi Paul & Valerie, IST has been qualitatively correlated to the results of T-cycling, however,a quantitative correlation is still lacking. By no means has IST "been thorougly modeled and been benchmarked to other standard stress tests." The necessary work to obtain the needed data has simply not been done. One effort published turned out to have data that clearly were incorrect. Regards, Werner Engelmaier, Chairman, IPC Reliability Committee --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------