This paper is a progress report on our work to create an open, flexible infrastructure to support virtual organisations through knowledge fusion technology. Knowledge fusion refers to the process of locating and extracting knowledge from multiple, heterogeneous on-line sources, and transforming it so that the union of the knowledge can be applied in problemsolving. When applied in enterprise-to-enterprise electronic commerce, the knowledge fusion process allows partners to exchange rich business information, and act in an agile and coordinated manner. As an example, we have created a demonstration application in the domain of telecommunications service provision, in collaboration with British Telecom. In our current work, we are extending our infrastructure to include mechanisms to regulate the operational marketplace, to ensure that a virtual organisation complies with the rules of the market.