Hi MoonMan, I need to burst your bubble, but neither HALT nor HAST are accelerated reliability tests, and therefore it is impossible to correlate the results from HALT/HAST to design rule selections (BGA pad sizes, etc., manufacturing processes, etc.) or other physical/material design parameters and the resulting reliability for product in normal use. HALT/HAST serve the purpose of extreme robustness tests, looking for weak spots, and cause failures with damage mechansims and failure modes not found in product use. HOWEVER, there sure are lots of data correlating the results from proper accelerated reliability tests to design rule selections (BGA pad sizes, etc., manufacturing processes, etc.) or other physical/material design parameters and the resulting reliability for product in normal use. That is how IPC-SM-785, IPC-D279 and IPC-9701 were developed. You have just been barking up the wrong tree--are there trees in your cave? Werner --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------