In the Project Management context, the right allocation of the individuals about their competences and availability for tasks execution reduces the risk as the planning deviations from the time, cost and quality of the project. To achieve these benefits, it is relevant to identify people with specific skills and knowledge required for the development of each project activity. In this sense, this article proposes a model to support the activity management and allocation of individuals in projects through an ontology based on the concepts of the Theory of Activity, seeking to help through consultations the allocating of appropriate resource. Through the scenarios presented for evaluation was demonstrated the suitability to use the model for assistance of project managers.