The present thesis was interested in the modeling of the co-creation of product and the service in a context of collaboration of companies and consumers. In the process of innovation, the model demonstrates the importance of taking into account 11 variables facilitators. In particular, the knowledge management and the categories of consumers. After a state of the art on the literature, a qualitative phase allowed to enrich the theretical framework experiment was implemented with 230 innovative companies. The quantitative analysis of the data allowed the validation of the model. 20 hypotheses were tested of which 16 have been completed, so allowing to demonstrate that the co-creation with the consumers allows for companies an enrichment of the process of innovation. All the components of the model allows a contribution for the management and the avenues of research for the innovative companies.