* Provides a skeptical view of the correctness of the system
* "Questioning" maybe "Investigation" is a better word (AT 01-13: maybe questioning is a better word after all. It is mentioned in the book Lessons Learned in Software Testing as one of the lessons: "Question everything, but not necessarily out loud". It helps also with your attitude: when you investigate then it is your problem, when you question something you just gather information).
* Does much more than test (assessment)
* Performs quality assurance functions (prevention)
* Help negotiate quality with the customer. An email conversation I had with David Evans reinforced to me that this is a critical principle that differentiates agile testing from traditional testing. -- LC
* Expose assumptions are being made
* Acts as a Change Agent
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