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01   information systems
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01 information systems






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01   information systems 01 information systems Presentation Transcript

  • Information Modelling
  • The Term Information System
    Information System
    Information System
  • 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]
  • Aspects of Systems
    Distinction in static systems and dynamic systems
    System strukture vs. system behaviour
    Refinement of systems through hierarchies
    [Ropohl 1978]
  • 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
  • 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]
  • Possible Actors Exchanging Data, Information and Knowldege
  • 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
  • Focus of the Lecture
  • 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
  • Information Modeling Basics
    Design Dimensions of Information Systems
  • The Architecture of Integrated Information Systems (ARIS)
    [Scheer 1992]
  • Design Layers of Software Engineering
    Waterfall Model of Software Engineering
  • ARIS Design Layers
    Domain language, semi-formal descriptions
    Model of the corporate reality, formal language
    Integration of technical issues into the model
  • Layers of Process-oriented Organizational Design
    PreparationofOrganizational Design
    StrategyandModelling Framework
    As-isModellingand As-is Analysis
    ProcessOrientedOrganizational Design
    ContinuousProcess Management
  • Focus of the Lecture Information Modeling
  • Information Modeling
    Structure of the Further Lecture
  • Concepts Covered by the Lecture
    [Scheer 1992]
  • Information Modelling Basics
    Information Systems