ACCT2000 Chapter Notes - Chapter 3: Data Flow Diagram, System Context Diagram
11 Oct 2018
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Document Summary
Documentation explains how a system works through narratives, flowcharts, diagrams and other written materials. A narrative description is a written, step-by-step explanation of system components and how they interact. A data flow diagram (dfd) is a graphical description of the flow of data within an organisation, including data sources/destinations, data flows, transformation processes and data storage. A data source is the entity that produces or sends the data that is entered into a system. A data destination is the entity that receives data produced by a system. A data flow is the movement of data among processes, stores, sources and destinations. A process is the action that transforms data into other data or information. A data store is the place or medium where system data is stored. A context diagram is the highest-level dfd; a summary-level view of a system, showing the data processing system, its input(s) and output(s) and their sources and destinations.
