Most enterprises today can be considered service providers in one way or other. Many of these service providing enterprises deliver end-products or services to their customers that are the result of some kind of informational activity, e.g. the booking of a holiday at a travel-agency, the preparation of a company's balance sheet by an independent accountant or the development of a supply chain management system. In this paper, the authors will present the results of research into fact oriented business service modeling. The set of modeling constructs that are defined in this paper are fully 'Compatible' with the models in the data oriented perspective in the fact oriented school of conceptual modeling.