Some sites we find useful.....

Systems and Systems Thinking:

Gene Bellinger's Mental Model Musings
Great info about modelling, simulation, and systems thinking.

A Primer on Systems Thinking & Organizational Learning
John Shilbey's excellent intro to systems thinking

Quality Standards, Tools, and Organizations:

The American Society for Quality
Training, Education, Publications, Certifications

    APQC (previously known as the American Productivity Center and the American Productivity & Quality Center)  : Benchmarking and Best      Practices

International Organization for Standardization
ISO Standards

Lean Six Sigma Links

Kaizen and Lean Manufacturing thoughts | Gemba Panta Rei
better ways to make things better

Curious Cat's Collection of Blogs