Once described social and historical reasons that have infused to the adolescence’s creation, in opposition to biology, the author explains the group function in this age of life. The attempt to increase the structural factors of personality within the group life and the emotional self help praxis are the bases to the establishment of the self help group Eclisse. The group born in Prato, out of a medical context, during the beginning of the ninety as a project of Tuscany Region. The experience lasted almost ten years, and the author has been the organizer and the participating observer too of the group dynamics. The group Eclisse characteristics are described: free admittance, meeting frequency, users typology, ecc. Once analysed the peculiarities of the transfert relationships between the adult observer and the young users, a meeting report is proposed. Finally, a discussed analysis follows about the group interactions.