Process capability indices are pretty well documented. Consider:
1 A good general SPC book like: Statistical Quality Control; EL Grant & RS Leavenworth; Mcgraw-Hill; ISBN 0078443547
2 Other good books are:
Statistical Process Control For SMT; WS Messina [check last month's SMTnnet Newsletter for a review and other information on this book]
Process Capability Indices In Theory And Practice; S Kotz & CR Lovelace; Arnold; ISBN 0340691778
3 Search the internet using your favorite brouser
4 Read pertinent articles on: http://www.qualityamerica.com/knowledgecente/knowctrSPC_Articles.htm and poke around their site for some other good stuff
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