I have a vested interest in asking this question, having recently been elected as the President of a subject association in Australia (the Social and Citizenship Education of Australia [SCEAA]). Our membership is comprised of teachers, teacher educators, and educators in cultural institutions. I think that they matter as: bringing together teachers with like-minded interests and areas of expertise and a sharing of practice (in our case at bi-annual conferences); networks for communication of latest subject-related news and updates; advocacy organizations with policy-makers and key educational agencies; and as sharing subject-related good practice and research with teachers (in our case via a professional academic journal). The list can be extended. But what do others think?