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I heard Sadler talk about his survey work just prior to it being
published.
There are so many other factors here (by his own admission) that even
declaring this 'negative evidence' goes too far. Once again, despite
John's
constant reference this or that research (psychological research in
essence--something we'd be wise to remember), common sense should not be
ignored. Students who 'intelligently' use their text book (which implies
they can actually read such), should certainly gain a bit over those who
simply listen to the lectures, or do the in-class exercises, etc. My own
exhortations about using the book is that, unlike class which by necessity
will deal in depth with only certain topics and be limited in examples and
background information, the book is organized to give a much more complete
treatment, with more examples, more proofs, more history. Students who
take
advantage of the resource will certainly profit--at least a little.
[Example of what Sadler said: The success without a text book often came
from classes where the instructor had basically prepared extensive notes
and
provided them to the class--essentially a 'book'. I may be wrong, but as
I
recall, much of the evaluation here was by grades, or success in a College
course to evaluate the High School course.]