Knowledge and competence management occupies a central place in many domains, considering the necessity for these domains to be aware of knowledge and competence of their actors, in order to follow them up, to identify possible gaps in the competences and so on. However, knowledge and competence management supposes a relevant modeling of these two concepts. In this paper, we propose a generic model for defining, representing, managing and exploiting knowledge and competences. This model may further be instantiated and used in different domains and with different types of actors (physical or moral). For the implementation of the proposed solution, a database of knowledge and competence is developed.