Interesting article about higher education at MPR:Is higher education losing its meaning?
"A new book on higher education shows more than a third of college students showed no significant improvements in learning over four years of schooling, while 45 percent showed little statistical improvement in performance by their sophomore year. Are easy course loads and active social lives degrading higher education?"
I have a number of ideas that correspond to the lack of growth with college students, including some that were suggested above. I think though the expectation that college students will learn the material without good teaching is most at fault here. Colleges have traditional just relied of presenting the information, and expecting the student to synthesis and comprehend it. That will work for your self-motivated, top students. But most students will struggle, and be drawn to other pursuits during college.