This note quickly analyzes the evolution of data management on employment intermediation and reviews the characteristics of three national studies in which, in order to establish skill gaps, data recorded in the databases of public or private labour intermediation companies have been extracted. Emphasis is placed on the evolution of the data; from the typical form completed by hand (1970s), which then moved to a computerized application (1990s) and which, at present, is in the world of the Internet or “the cloud”, as they say.