I think the acronym is a bit cutesy, but I like this discussion of question types and methodologies. We don't see a lot on question formation, but a good survey of recent work is provided in the introduction. As for the CREST+ model itself, it is mostly a taxonomy of question types. So far so good, but we want to be more probing. What do we do with different types of questions? What effects do they have? Questions don't merely query, they also frame discussions. They create some possibilities, eliminate others. What happens when these possibilities exceed the bounds of experience? Or constrain them?
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