Should “pay for performance” be used for teachers? (With a plea to pause before you answer)

Few issues in education are as polarising as proposals to introduce “pay for performance” for teachers. This blog is not an attempt to persuade you that such proposals are right or that they are wrong. Rather, it is a plea for us all to pause, unpack the question, and appreciate that arguments about the external validity and contextual nature of “the evidence” cut both ways.