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I'm glad I'm not the only person with that impression of Hewitt. I
only used it once, but found that his "conceptual" explanations really
didn't foster understanding. Rather, they encouraged the student to
memorize the "conceptual" answer. In later versions since I used the
book it might have changed its approach to math, but I found that he
avoided even the simplest math in some cases, math that would have
made the conceptual image clear. Instead, he went around the math and
came up with his non-mathematical explanation that gave students the
impression they should be able to do the same thing. Students became
frustrated that they couldn't just "look at a situation" and figure
out what was going on.