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Lecture Enterprise information systems: A pattern-based approach (3/e): Chapter 5 - Cheryl Dunn, J. Owen Cherrington, Anita Hollander

Chapter 5 - Task level modeling. The objective of this chapter is to introduce some tools for documenting the task level detail of business processes. The task level in REA modeling is the level at which workflow is documented. | Chapter 5 Task Level Modeling Chapter Learning Objectives Explain the difference between task level and business process level representations for an enterprise Describe and prepare flowcharts describing the documents, data flows, and processes of an enterprise system Describe and prepare data flow diagrams depicting the flow of data through an enterprise system Identify the similarities and differences between system flowcharts and data flow diagrams Describe various kinds of physical media, file types, and processing methods used in information systems Introduction Tasks are the individual steps involved in accomplishing events in an enterprise Events are tasks; however, not all tasks should be represented as events Tasks that are activities that may be changed or eliminated without substantially changing the nature of the enterprise should not serve as foundational elements in an enterprise information system database The purpose of task level models is NOT to design a database; rather, it is to document the flow of data through an enterprise No pattern has yet been identified at the task level System Flowcharts Graphically document information systems Summarize pages of narrative in diagrammatic format Focus on the physical aspects of information flows System Flowcharts: Basic Elements System flowcharts may be drawn freehand or with a plastic flowchart template/stencil tool. System flowcharts may be prepared using software created for that purpose. E.g. SmartDraw, Visio, ABC Flowcharter Microsoft Word and Powerpoint (but they are not as automated) System flowcharts combine three simple graphical elements to represent various types of physical information flows and processes Symbols Flow Lines Cashier Dept A Bank Areas of Responsibility Example System Flowchart Flowchart Symbols Flowchart Symbols: Documents More Flowchart Symbols Flow Lines Flow lines are used to connect the symbols on the document flow chart. A solid line . | Chapter 5 Task Level Modeling Chapter Learning Objectives Explain the difference between task level and business process level representations for an enterprise Describe and prepare flowcharts describing the documents, data flows, and processes of an enterprise system Describe and prepare data flow diagrams depicting the flow of data through an enterprise system Identify the similarities and differences between system flowcharts and data flow diagrams Describe various kinds of physical media, file types, and processing methods used in information systems Introduction Tasks are the individual steps involved in accomplishing events in an enterprise Events are tasks; however, not all tasks should be represented as events Tasks that are activities that may be changed or eliminated without substantially changing the nature of the enterprise should not serve as foundational elements in an enterprise information system database The purpose of task level models is NOT to design a .