In general an enterprise model consists of a description of things over which the organisation has control (such as people, material or processes) and a description of what the organisation can do with those things (such as hire, purchase or analyse respectively).
The model need not be all encompassing: it could be a significant subset of things over which the organisation has control and still fit the definition in A Working Definition.
An organisation can choose to include things over which it does not have complete direct control, such as the parts purchased from a supplier or the interactions with the supplier. Thus we can distinguish between "intraenterprise'' and "interenterprise'' modelling [2]. The difficulty with interenterprise modelling is that other organisations may have different goals, so it is appropriate only in cases where the interactions are well defined and have a common goal, such as the building of a large aircraft.
The Suppliers' Working Group (SWG, composed of enterprise integration suppliers in the USA), have distinguished in their Reference Taxonomy [3] between "services'' and "information''. Services are those things which "perform some processing or state-transition function''. Examples might be the manufacture of a widget, the sale of a product, the hiring of a person or the improvement of a process. Information is "the collection of all of the knowledge found in an enterprise''. Examples might be the definition of a manufacturing process, the cost of manufacture, the technical specification of the material used or the profile of the expected customer. Thus information "can be a model OF a service, be ... ABOUT a service, be ... USED BY a service, or have any of many other relationships.'' Information is any description of any aspect of the service.
Thus the enterprise model really contains what the SWG have called "information''. Usually the motivation for enterprise modelling, as suggested in Why Build Enterprise Models?, is to model a variety of services with the intention of managing, improving, modifying or redesigning them.