This paper is premised on the view that it is premature to write about the end of modernity. Moreover it is argued that, for all the flaws of early Enlightenment philosophy, what Jurgen Habermas has termed the 'project of modernity' should be seen as incomplete, rather than abandoned. Drawing more generally on Habermas' theories, five metatheoretical theses are outlined and elaborated. These, it is suggested, might set the parameters for a fin-de-siècle sociology, geared above all to the rationalisation of the lifeworld, which is both credible and critical in orientation. [ABSTRACT FROM AUTHOR]