Presents research on cognitive skills demanded by elementary and secondary school mathematics textbooks, based on an original 10-level classification of thinking activities; reports a general decline both in the amount of material demanding student involvement and in the percentage of that material requiring higher-order thinking. (MCG)

In this interview, author Art Costa asserts that the teaching of either content or thinking skills in isolation is unproductive. To combine these approaches, he recommends selecting content for its relationship to thought processes. He also observes that administrators who model intelligent behavior thereby create a climate for thinking. (TE)