I'm not familiar with 217 but have used Bellcore 332 for a while. Even copied the charts from 332 into an Excel spreadsheet to crosscheck the Relex software. Then used the Relex software. Can change all sorts of parameters on the spot. If you've got a little time, then just copy the charts out of 332 and fo it by hand which really isn't that difficult. The 332 way is very easy. Pay $150 for the standard, identify the FITs for each component, it's a snap. Regards, Doug McKean > Justin Braime wrote: > > What is the best method for calculating an MTBF figure for your > average, run of the mill, electronic assembly? > Are Bellcore TR-332 and MIL-HDBK-217 still the most current standards > in this area, or has IPC come out with something? ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################