In this article, we begin by questioning the notion of special educational needs, which is used today in Switzerland, by going back over its historical foundations and developing the main issues and problems it raises. We then present the results of a comprehensive research aimed at uncovering the factors at work in the process of designating certain students for an enhanced special education support measure during their compulsory schooling. On the basis of a content analysis of the reports for an (...) enhanced special education support measure produced during the 2016-2017 school year in a Swiss canton, as well as comprehensive interviews conducted with permanent teachers, we highlight various factors that can lead to the designation of a student for an enhanced special education support measure. We show how there is a degree of randomness in being designated for a special education support measure and critically discuss the role of the school institution and its actors in this process. (shrink)