Every individual has benefitted from some kind of experience (professional or personal).The question is what does one draw from experience ? The Accreditation of previous learning proposes an approach that evaluates this previous experience using a set of historic, legal and philosophical markers. Within the Accreditation of previous learning framework, it is possible to assess the validity and the legitimacy of an action plan concerning professional practices. My dissertation applies this approach to the social and medical-social sector. The Accreditation of previous learning could be considered as a relatively recent training system which could eventually influence other types of training courses and the actors involved in them.The main objective of this qualitative and empirical study is to highlight the effects of the Accreditation of previous learning plan on the candidates as well as on other actors. I analysed the data recorded in the logbook during in situ observation, and the result of twenty semi-directive interviews. The research results show the necessity of designing social and medical-social work, from the perspective of a process of inevitable change, taking place in the candidate’s for the Accreditation of previous learning, and of modifying the way social and medical-social institutions work as well as the way actors participate in them.