The birth moment of economics and sociology of conventions (EC/SC) was partly based on the questioning of institutional categorizations that shape work and economic activities. Within this framework of EC/SC, the sociology of quantification and categorization offers a fruitful approach to this line of research: the relationships that are built between official (or scholar) classifications and ordinary categorizations of the social space. Laurent Thévenot and Luc Boltanski’s survey based on games constituted an original empirical operationalization of this question in the early 1980s. This chapter first looks at the design of this innovative survey, the aim of which was to put individuals in a position to produce their own classification of the world of work and then at its main contributions. It then shows how this survey is the basis for a number of questions and concepts in convention theory. Finally, this chapter presents the subsequent uses and posterity of this survey in the social sciences in France and other countries.