I think it can be helpful to know the history of the topic as well. Cem Kaner, James Bach and Bret Pettichord devised the concept of using "schools" to discuss different approaches to software testing. Originally there were four schools: analytic, standard, context and quality. A few years after the concept of schools was introduced, Bret updated the schools to include a fifth school known as agile.
- "Four schools of software testing," Bret Pettichord, revised in 2007.
- Cem Kaner's blog on the schools.
- The context-driven approach to testing.
- The manifesto for agile software development.
In recent months, the schools of software testing has been a heated topic in the blogosphere community. Opinions vary on the topic and the discussion has raised arguments over the years. You might consider googling to see what opinions have been posted. See Cem Kaner's blog (above) to gain insights into some of discussions. If I was writing a white paper on the topic, I would include the fact that so much discussion and at times arguing has taken place over the concept of the schools no matter where you find, or whether you find, your own approaches aligning with the schools.
Recently, Scott Barber and I recorded a webcast discussing the schools of software testing. (I'm not sure how long the webcast will be active.) The webcast compares and contrasts the schools as well as discusses the background and arguments around the topic.
Best of luck on your research and writing -- there's plenty of material to delve into.
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