A few TestBooks that you might find interesting to understand the concept of Testing Practices. Give the title and the ISBN number at least and maybe a description on which parts are relevant to W3C Work.
Title: Software Testing by Ron Patton
Chapter 2 explains "Software development process" and gives hints on different cycles models.
- Big Bang Model
- Code-and-Fix Model
- Waterfall Model
- Spiral Model
Chapter 12 is about "Testing the Documentation" which is slighty related of testing a document and it's usability, which has implication in W3C Work.
Title: Testing Applications on the Web by Hung Q. Nguyen
Chapter 2 is interesting and explains "Web Testing versus Traditional Testing". Chapter 6 gives hints on "Test Planning Fundamentals".