In the last two decades, the quest for a widely accepted definition of social enterprise (SE) has been a central issue in a great number of publications. The main objective of the ICSEM Project was to show that the SE field would benefit much more from linking conceptualisation efforts to the huge diversity of social enterprises than from an additional and ambitious attempt at providing an encompassing definition. Starting from a hypothesis that could be termed “the impossibility of a unified definition”, the ICSEM Project adopted a twofold research strategy: providing strong theoretical foundations to explain how various “institutional logics” in the whole economy may generate different SE models and relying on bottom-up approaches to capt...