This is not to say that teaching is not informed by evidence, but rather, that teaching is not prescribed by evidence. The causal relations are simply not sufficiently strong. "Physics works because protons and electrons don’t have good days and bad days; they behave consistently, and predictably." And it does not follow that teaching is not a profession. "Teaching appears to be less "professional" than other professions because the problems that teachers need to solve are just much harder." I think of teaching - and education generally - to be more akin to designing than to engineering.