This paper introduces a new approach to draw up business competencies as well as to facilitate their exchange and diffusion through an e-marketplace. The business model and a view on a technical solution to implement « B-C Market » has been built in the context of an e-marketplace. Obviously, the main challenge to cope is to find a way to outline and retrieve the competencies. Business competency representation must be flexible enough to allow every company describe its own business, and explicit enough to reveal the relevant ones. Therefore the first effort was to develop a reference model of business competencies. Then, we aimed to adjust it to several domains.