1. Information Modelling

2. The Term Information System Information System Information System

3. Systems Theory A system contains elements and relationships of elements that are distinguished from a system‘s environment Distinction in open systems and closed systems [Pfeifer 2003; Ackhoff 1971, Hill et al. 1989]

4. Aspects of Systems Distinction in static systems and dynamic systems System strukture vs. system behaviour Refinement of systems through hierarchies [Ropohl 1978]

5. Information – some Definitions „Information is information,it‘s neither matter nor energy“ (Wiener) Information = increase of knowledge that is relevant for decisions „informare“ (Latin) = „to give sth. a shape“ d. h. increase of knowledge in order to decrease uncertainty Information = „purpose oriented“ knowledge

6. Semiotics Theory of signs Syntax layer: Set of signs + position of signs = data Example 1: correct spelling of a word Example 2: correct sentence structure Semantics layer: Data + Meaning of data = information Example: „tree“ is a word that is syntactically correct.The meaning of „tree“ is „big plant“ Pragmatics Layer: Information + context = knowledge Example: the information „it‘s cold outside“ implies the task „put on jacket“ in certain situations [Bußmann 1990]

7. Possible Actors Exchanging Data, Information and Knowldege

8. Definition Information System Information Systems are special systems that serve the processing of information (cf. preceding definitions) Derivable characteristics Human individuals are necessary in order to process information corporate organisation as a part of information systems Subset of information: data data processing can be automated Application systems as a part of informationssystemen Hardware systems and software systems Information systems = Social and technical systems, so-called human-task-technology-systems

9. Focus of the Lecture

10. Aspects of Information Systems Struktural aspect Elements that are interrelated Example: A function of an application system accesses data Functional aspect Information processing Example: claim notification – claim processing Hierarchical aspect Partition in sub-systems Bsp.: division– department – job Information systems are open, dynamic systems

11. Information Modeling Basics Design Dimensions of Information Systems

12. The Architecture of Integrated Information Systems (ARIS) [Scheer 1992]

13. Design Layers of Software Engineering Waterfall Model of Software Engineering

14. ARIS Design Layers Domain language, semi-formal descriptions Model of the corporate reality, formal language Integration of technical issues into the model Coding

15. Layers of Process-oriented Organizational Design PreparationofOrganizational Design StrategyandModelling Framework As-isModellingand As-is Analysis To-beModellingandProcessOptimization ProcessOrientedOrganizational Design Roll-out ContinuousProcess Management

16. Focus of the Lecture Information Modeling

17. Information Modeling Structure of the Further Lecture

18. Concepts Covered by the Lecture [Scheer 1992]

19. Information Modelling Basics Information Systems