which the graphic note of object-role modeling is integrated. These concepts were also developed by Dietz and others into a framework for enterprise architecture, entitled Architecture Framework (XAF). In the new millennium the French company Sogeti developed a methodology based on the DEMO, called Pronto. The further development of DEMO is supported by the international Enterprise Engineering Institute, based in Delft in The Netherlands. DEMO, topics Pattern of a business transaction In DEMO the basic pattern of a business transaction is composed of the following three phases: An actagenic phase during which a client requests a fact from the supplier agent. The action execution which will generate the required fact A factagenic phase, which leads the client to accept the results reported Basic transactions can be composed to account for complex transactions. The DEMO methodology gives the analyst an understanding of the business processes of the organization, as well as the agents involved, but is less clear about pragmatics aspects of the transaction, such as the conversation structure and the intentions generated in each agents mind. Abstraction levels DEMO assumes that an organization consists of three integrated layers: B-organization, I-organization and D-organization. The B-organization or business layer according to DEMO is the essence of the organization, regardless of the device is possible there. Understanding the business layer is the right starting point in setting up an organization, including the software to support business processes. This vision leads to a division into three perspectives or levels of abstraction: Essential: business system or the B system Informational: either the information I system Documenteel: data system either D system At each level has its own category of systems at that level "active": there are so B systems (of company and business), I-systems (of informational and information) and D systems (from documenteel and data) . The main focus in DEMO is focused on the critical level, the other two are, therefore, less discussed in detail. The ontological model of an organization The ontological model of an organisation in DEMO-3 consists of the integrated whole of four aspect models, each taking a specific view on the organisation: Construction Model (CM) Process Model (PM) Action Model (AM), and Fact Model (FM) There are two ways of representing these aspect models: graphically, in diagrams and tables, and textually, in DEMOSL. Construction Model The Construction Model (CM) of an organisation is the ontological model of its construction: the