Abstract
This contribution focuses on the identity construction process and on the knowledge appropriation of the future specialised educators in the course of their training program. The content addressed during the studies and the internship experience leads to put into perspective the knowledge acquired in the lights of the future trade. All of this is the subject of identity transactions, both biographical and relational. The portraits of two students met in their second and third year of training bear witness to their singular professionalisation and highlight a certain number of challenges to be overcome in order to build themselves as professionals.