Richard,
Are the layers supposed to indicate a hierarchy within the Essential
characteristics? They do to me, which makes it seem like there are
essentialer characteristics, or a flow you imply but don't describe.
Furthermore, though Controllability, Understandability, and Relevance
all dance around this, I think Predictability bears mention as a
necessary element. Very few experiences are enjoyable that are not
predictable, and those tend to be highly specialized, and, in some
way, their lack of predictability is predictable, so...
Phillip
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