This paper is intended to draw the main theoretical lines of the notion of value, in order to avoid some flaws in the quantitative surveys on values as well as in some qualitative studies of value judgements. Through a number of redefinitions based on a pragmatic approach, inspired not only by Dewey’s concept of ‘valuation’ but also by the new French pragmatic sociology and by the pragmatist trend in linguistics, it tries to specify the conditions under which sociology can address (...) the notion of ‘value’ while avoiding their reduction to scholarly supports for morals or normative guides for action and evaluation. Meanwhile, it tries to construct a unified concept of value that would work for all the concerned disciplines: not only sociology but also economics, psychology, anthropology, and even philosophy. (shrink)