This research studies the forms that were adopted by industrial learning in the city of Buenos Aires in the first half of the 19th century, in the framework of a legislation inspired by the French Model that was trying to shape an industrial working class in the workshops of a city committed to expand its production. Young people used to work under the protection and guidance of the master craftsmen, who assumed their professional training and the wide range of the obligations that were inherent to the role of a pater. These obligations were estab lished by contracts insured under the rubric of notaries or the spontaneous and widespread practice of police registration. In this relation between masters and apprentices interests, we can observe different interests, but these two groups needed each other, so those different interests were merged into the same goal. The system, although it did not meant the development of a significant industrial class, developed because the apprentices became the masters and installed their own workshops.