The label ‘Frankfurt School’ became popular in the ‘positivism dispute’ in the mid-1960s, but this article shows that it is wrong to describe Jürgen Habermas as representing a ‘second generation’ of exponents of critical theory. His communication theory of society is intended not as a transformation of, but as an alternative to, the older tradition of thought represented by Adorno and Horkheimer. The novel and innovative character of Habermas’s approach is demonstrated in relation to three thematic complexes: (1) the public sphere and language; (2) democracy and the constitutional state; and (3) system and lifeworld as categories for a theory of modernity.