What I found most interesting, was the number of (knowledgeable, technical) participants who weren't aware that certain quality attributes even existed. Using the taxonomy not only forced them to consider unfamiliar quality attributes, but also stopped them over-focusing on well-known ones as they were aware of how many they needed to discuss in a short period of time! This activity *has* to be time-boxed.
I would be interested in a taxonomy repository but we'd need domain experts or permission to transpose from elsewhere.
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