01 information systems


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01 information systems

  1. 1. Information Modelling<br />
  2. 2. The Term Information System<br />Information System<br />Information System<br />
  3. 3. Systems Theory<br />A system contains elements and relationships of elements that are distinguished from a system‘s environment<br />Distinction in open systems and closed systems<br />[Pfeifer 2003; Ackhoff 1971, Hill et al. 1989]<br />
  4. 4. Aspects of Systems<br />Distinction in static systems and dynamic systems<br />System strukture vs. system behaviour<br />Refinement of systems through hierarchies<br />[Ropohl 1978]<br />
  5. 5. Information – some Definitions<br />„Information is information,it‘s neither matter nor energy“ (Wiener)<br />Information = increase of knowledge that is relevant for decisions<br />„informare“ (Latin) = „to give sth. a shape“<br />d. h. increase of knowledge in order to decrease uncertainty<br />Information = „purpose oriented“ knowledge<br />
  6. 6. Semiotics<br />Theory of signs<br />Syntax layer:<br />Set of signs + position of signs = data<br />Example 1: correct spelling of a word<br />Example 2: correct sentence structure <br />Semantics layer:<br />Data + Meaning of data = information<br />Example: „tree“ is a word that is syntactically correct.The meaning of „tree“ is „big plant“<br />Pragmatics Layer:<br />Information + context = knowledge<br />Example: the information „it‘s cold outside“ implies the task „put on jacket“ in certain situations <br />[Bußmann 1990]<br />
  7. 7. Possible Actors Exchanging Data, Information and Knowldege<br />
  8. 8. Definition Information System<br />Information Systems are special systems that serve the processing of information (cf. preceding definitions)<br />Derivable characteristics<br />Human individuals are necessary in order to process information corporate organisation as a part of information systems<br />Subset of information: data data processing can be automated Application systems as a part of informationssystemen<br />Hardware systems and software systems<br />Information systems = Social and technical systems, so-called human-task-technology-systems<br />
  9. 9. Focus of the Lecture<br />
  10. 10. Aspects of Information Systems<br />Struktural aspect<br />Elements that are interrelated<br />Example: A function of an application system accesses data<br />Functional aspect<br />Information processing<br />Example: claim notification – claim processing<br />Hierarchical aspect<br />Partition in sub-systems<br />Bsp.: division– department – job<br />Information systems are open, dynamic systems<br />
  11. 11. Information Modeling Basics<br />Design Dimensions of Information Systems<br />
  12. 12. The Architecture of Integrated Information Systems (ARIS)<br />[Scheer 1992]<br />
  13. 13. Design Layers of Software Engineering<br />Waterfall Model of Software Engineering<br />
  14. 14. ARIS Design Layers<br />Domain language, semi-formal descriptions<br />Model of the corporate reality, formal language<br />Integration of technical issues into the model<br />Coding<br />
  15. 15. Layers of Process-oriented Organizational Design<br />PreparationofOrganizational Design<br />StrategyandModelling Framework<br />As-isModellingand As-is Analysis<br />To-beModellingandProcessOptimization<br />ProcessOrientedOrganizational Design<br />Roll-out<br />ContinuousProcess Management<br />
  16. 16. Focus of the Lecture Information Modeling<br />
  17. 17. Information Modeling<br />Structure of the Further Lecture<br />
  18. 18. Concepts Covered by the Lecture<br />[Scheer 1992]<br />
  19. 19. Information Modelling Basics<br />Information Systems<br />