Student evaluations (against which I have inveighed since I first saw them in the ’60s) are all wrong as a way of assessing teaching performance: they measure present satisfaction in relation to a set of expectations that may have little to do with the deep efficacy of learning. Students tend to like everything neatly laid out; they want to know exactly where they are; they don’t welcome the introduction of multiple perspectives, especially when no master perspective reconciles them; they want the answers.
But sometimes (although not always) effective teaching involves the deliberate inducing of confusion, the withholding of clarity, the refusal to provide answers; sometimes a class or an entire semester is spent being taken down various garden paths leading to dead ends that require inquiry to begin all over again, with the same discombobulating result; sometimes your expectations have been systematically disappointed. And sometimes that disappointment, while extremely annoying at the moment, is the sign that you’ve just been the beneficiary of a great course, although you may not realize it for decades.
Needless to say, that kind of teaching is unlikely to receive high marks on a questionnaire that rewards the linear delivery of information and penalizes a pedagogy that probes, discomforts and fails to provide closure. Student evaluations, by their very nature, can only recognize, and by recognizing encourage, assembly-line teaching that delivers a nicely packaged product that can be assessed as easily and immediately as one assesses the quality of a hamburger. . . .
Read the rest here: http://opinionator.blogs.nytimes.com/2010/06/21/deep-in-the-heart-of-texas/.