Introduction -- The classical theories -- Emile Durkheim -- Talcott Parsons and structural functionalism -- Karl Marx and marxism -- Max Weber -- The successors -- Norbert Elias -- Critical theory, the Frankfurt school and Jurgen Habermas -- Herbert Blumer and symbolic interactionism -- Michel Foucault -- Pierre Bourdieu -- The present -- The latest modern age -- Modernisation theory -- Conclusions.