Getting better at any activity is contingent on good quality feedback. Unfortunately, in the tertiary teaching context, we rely heavily on the bluntest of tools, the student feedback survey. While these defects are well known to those who are clued in on teaching and learning issues, they are often used by administrators and bureaucrats who don't understand how to interpret the data, especially for the purposes of promotions. Worse, some unis want to use these surveys to performance manage staff or even want to publish them like ratemyteacher.com.
