This dissertation has as main purpose to answer the following question: is there an existing theoretical model for Project Services that can be applied by a service provider of collective purchasing? For this analysis a comprehensive review of the existing models was conducted, as well as of the research unit, the object of this study, the Collective Purchasing Sites. Starting from a descriptive research, this study ultimately proposes a schematic model for the project service of a collective purchasing site, which represents the current globalized and interconnected world through the media, via internet. As a result of the work, it is worth noting that the project design for Collective Purchasing Sites enables to encompass three factors that increase its chances of success. First, the service becomes oriented to the market, in this case to the virtual consumers. Second, it conducts feasibility studies and detailed specification that consider the characteristics of the target audience, the consumer market, of each offer and the competition. And, at last, the project gives much attention to the quality of service development through the information to correct or improve its performance.