Wittgenstein's understanding of 'family resemblance' and Chomsky's 'linguistic universals' are interpreted, contrary to Hamlyn, as reconcilable notions that can both illuminate and refine Hirst's understanding of 'categorical concepts'. In the light of such a reformulated theory, Brent suggest ways in which a unified model of the social sciences could yield a unified curriculum theory. This title will be of interest to students of the philosophy of education and curriculum studies.