These resources might help:
An Introduction to Quality Assurance in Health Care by Avedis Donabedian
[i]Measuring Quality Improvement in Healthcare A Guide to Statistical Process Control Applications[i] by Raymond G. Carey, PhD & Rober C. Lloyd, PhD.
www.ncqa.org
www.ahrq.gov
Also, do a search for quality assurance in health care. There may be some helpful sites there.
Hope this helps you out a little bit.
Linda