This is a project from a Physics Education Research group, so the topic is pretty much their bread and butter. I think they probably hope that their methods wil

This is a project from a Physics Education Research group, so the topic is pretty much their bread and butter. I think they probably hope that their methods will apply throughout the sciences and beyond eventually, but you can't blame them for building on their own field first. (PER is also the best established science ed. discipline, as far as I'm aware.)