Although I won't be able to make it, one thing I would (if I could make it) like to hear discussed is the issue of allowing users who don't otherwise struggle with using something to hold misperceptions about how that something works, and when that's appropriate or not appropriate. I tried to explain what I mean on my blog, but as I thought about this problem myself my conclusion was that if the cost of misperception is low, then allowing misperception may be appropriate, while if the cost of misperception is high, then allowing misperception is inappropriate.
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