From the great essay “The QA Mindset” at http://randsinrepose.com/archives/the-qa-mindset/ …
A healthy development team was one that had engineers doing their best to build a great product. These engineers were paired with a team of QA engineers who were doing their best to prove the product wasn’t great. These conflicting goals result in what I consider to be an essential healthy tension between engineering and QA.
I for one am very grateful for our newly-evolving QA mindset, and thankful for all of you volunteering to help us create the healthy tension described above.