1. 1 Object Role Modeling Sander van der Rijnst

2. 2 Outline  Background  Object Role Modeling method  Process Deliverable Diagram  Example  Discussion

3. 3 Background  First concept created by Nijssen in the 1970s Natural language Information Analysis Method (NIAM)  Formalized in 1989 by Halpin Object Role Modeling  Several dialects exists FCO-IM, FORM

4. 4 Timeline

5. 5 Thee basic principles  Communication Oriented Does not model reality, but models the communication about reality (i.e. the facts and nothing but the facts)  Conceptuality All conceptual aspects of the communication should be modelled  Validation Users should be able to validate that their communication is correctly modelled without having to understand the model itself

6. 6 Object Role Modeling  Is based on concrete information and examples in documents and conversations  Is in the form of a language, e.g. English, Dutch or even Chinese  Is in the natural language of the Universe of Discourse

7. 7 Traditional Waterfall Development Approach Requirements Design Implement Test Release Feasibility

8. 8 Design phase Conceptual information model Verbalization of examples Universe of Discourse perspective of domain expert perspective of information analyst interview level

9. 9 Notation  Supported by CASE-tools PersonInstrument PersonInstrument NN EmployeeDepartment EmployeeDepartment N1... plays...... works for... plays works for

10. 10 Process Deliverable Diagram

11. 11

12. 12 Example “Room 211 of building MIN has a capacity of 80 seats” “MIN is an abbreviation of Minnaert” “ Room 211 of building MIN is of the room type amfitheater ” “Room 211 of building MIN is equipped with a PC”

13. 13 Let’s model (1) Capacity “Room 211 of building MIN has a capacity of 80 seats” Room Number

14. 14 Let’s model (2) Capacity “Room 211 of building MIN has a capacity of 80 seats” Room Number “Room 211 of building MIN” Room identifier Building

15. 15 Let’s model (3) Capacity “Room 211 of building MIN has a capacity of 80 seats” Room Number “Room 211 of building MIN” Room identifier Building “building MIN” Code

16. 16

17. 17 Conclusion  Fact-oriented modeling approach  Communication Oriented  Conceptual level  User Validated  Derive ERM models or UML class diagrams

18. 18 Questions?