ooo... found good stuff on software quality!

Typical metrics:
http://www.scribd.com/doc/7010681/So...uality-Metrics

Formal softtware testing (outside the scope of most projects here, but I found good material in its 732 pages:
http://digi.physic.ut.ee/tanel/books...g.eBook-KB.pdf

So far I've come across vague statements asserting that more testers can increase confidence levels in results, but nothing matching what I suggested yet. However, the following describes a methodology for building a software test plan and may be useful:

http://www.lucas.lth.se/publications...erssonCdoc.pdf