On Vygotsky, from The Chemical Education Research Group Lecture 2000
Sadly, as he is the new Piaget, his ideas will be seen as the new educational panacea, and will fail to match this, and will then be judged as having themselves failed. That is my prediction, in any case. If you are not familiar with the ideas of Piaget, think Freud and you get my gist.
This is an interesting meta analysis on the state of Chemistry Education Research,