Greg makes an interesting point in this post, and he sure made me think. I’m don’t agree for a full 100%, as I’ve seen both poor teaching techniques survive for a long time but others also disappear rather quick. And: also in medicine there is also something such as ‘alternative’ approaches that just don’t seem to disappear. A third element I want to add is that maybe the different opinions on what is good education (often hiding in fact an opinion about the curriculum).