Abstract
The various academic works about the analysis of the actual functionning of alternation in professionnal training reveal a great descrepancy with the prescriptive model, qualified institutionnal or organisationnal model. In order to take some distance from this technical coordinative model of alternation in training, the hypothesis is made that the alternant is the one creating bonds.The results of an active resarch, based on the experimentation of a pro-training arrangement made to support this bonding work, are presented and put in perspective with the initial hypothesis. This bonding work is considered a reliance activity of the alternants. Also, the pro-training arrangement built from the richness of the class-group, born from the commitment of the alternants, creates a typical dynamic which we chose to call actor-network.