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G063 - Data flow diagrams

G063 - Data flow diagrams. Learning Objectives:. By the end of this topic you should be able to: describe, interpret and create data flow diagrams. Data Flow Diagrams. show how data moves through a system show the processes that transform inputs into outputs Utilises: external entities

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G063 - Data flow diagrams

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  1. G063 - Data flow diagrams

  2. Learning Objectives: By the end of this topic you should be able to: • describe, interpret and create data flow diagrams

  3. Data Flow Diagrams • show how data moves through a system • show the processes that transform inputs into outputs Utilises: • external entities • represent people, organisations …. • processes • transforms input data into output data • data stores • database file, a paper form, folder in a filing cabinet • flow of data • direction of flow of data in the system

  4. Data Flow Diagrams DFD levels • level 0 (L0) = summary of the system • does not show processes or data stores detail • level 1 (L1) = overview of what is happening within the system • represented in the L0 diagram by central process box

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