Has anyone found a Statistical Process Control (SPC) book or software program they like? I need to set up something for a small fab and track the usual things: sheet rho, thicknesses, etch depths, critical dimensions, etc. Thanks very much, Roger Brennan Home: 1403 Forrestal Avenue San Jose, CA 95110 (408)453-0711 (telephone) (408)573-9407 (fax) rogerbr@earthlink.net Work: Endevco 355 N. Pastoria Ave. Sunnyvale, CA 94085 408-739-3533 ext 204 roger.brennan@endevco.com