After having situated the interaction between the implementation of new information and communication technology (NICT) supply and the creation of social uses within the context of the convergence of telecommunications and cable distribution, the authors have as their objective the identification of the stages periodizing the implementation and generalization of telematics, the identification of actors having a structuring role throughout this process, and the understanding of the action determining its evolution during each stage. To this end, the authors draw from the results of two studies: one of Minitel, the other of Videoway. Six periods are described and analyzed: 1) the elaboration of a social project of computerization in which the state plays the central role: 2) the establisment of a technical norm and the taking charge of the concrete realization of the project b industrial actors; 3) the creation and testing of a prototype, which permits the refinement of the technological proposition; 4) the initiation of the socialization of the new technology by means of large scale experiments implicating the public at large, which mark the entrance of users as actors truly active in the ongoing process; 5) the first phase of commercialization during which the suppli is refined, particularly at the level of content, and in which the supply achieves a critical mass of consumers, thereby justifying its generalization efforts; 6) finally, the generalization is accomplished without, however, affecting the entire population, and is merged with a movement of diversification and penetration into a larger set of social practices. In conclusion, the authors underline the conditions of the generalization of computerization and the role of convergence as the decisive moment in the process of computerization.