The paper his divided into two parts, preceded by a brief premise. The first part deal with the reasons why it is important to reflect on work classification methodologies; this allowed to map the path of volume and the essays collected, presented in the second part of the contribution. The issues discussed concern the relation between work classifications and the representation of economic and social paradigms; the relation between ways to represent the work and effects they produce on work real experiences (in the market, politics, representation, ecc.). In this perspective, the article depicts the characteristics of transparency/ opacity of production processes of classifications of work and the problem about open the "black box" of classifications. Furthermore the article analyzes on the relationship between the object of representation (job content) and subject of representation (workers). Finally, it concludes with the analysis of the consequences of the representations in terms of impact on inequality, on the attribution of responsibility, on capacity of voice, on democratic processes.
Keywords: Classifications of work, common knowledge, representation, capacity of voice, public sphere