Barry, I first suggest that you get a copy of "Design and Analysis of Experiments" by Douglas C. Montgomery. A very good text in practical DOE strategies. Unless you know some of the basics of statistical design, you might craft a beautiful DOE that tells you nothing. You will be able to come to the wrong conclusion with absolute confidence. As far software goes, I use Stat-Ease Design Expert 6. Easy to use and gives you the elementary statistics and diagnostics I need most of the time. The other large statistical packages, (SPSS, Systat, SAS) should all do this as well. Doug Pauls Rockwell Collins --------------------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------------------