I agree with the usefulness of using the Advance Organizer for "preparing the learners' minds." So, in an intro to a concept, it is more helpful early-on in a lesson than later or not at all. This allows students to have a 'framework' from which to move forth . . .
re: "David Ausubel . . . an unusual educatonal theorist:
"Before we can present new material effectively, we must increase the stability and clarity of our students' structures.
"This is done by giving them concepts that govern information to be presented to them.
"If the learner begins with the right "set," and if the material is solidly organized, then meaningful learning can occur."
". . . there is a parallel between the way subject matter is organized and the way people organize knowledge in their minds . . ."
- Joyce & Weil, p.249-250
