AFM341 Chapter Notes - Chapter 3: Data Flow Diagram, Flowchart, Data Store

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If two or more data flows move together, a single line is used: processes: transformation of data, data store: repository of data, does not show the physical storage medium. Some inputs and outputs are excluded, e. g. those not related to an external entity or another process. Successively lower level provide increasing amounts of detail. Guidelines for drawing a dfd: understand the system, observe organization data flows, interview those who use and process the data, reading a narrative description of the system, walk through system transactions. Identify each temporary or permanent data repository and each data flow in and out of it. Flowchart: pictorial, analytical technique used to describe some aspect of an information system in a clear, concise, and logical manner: how business processes are performed, how documents flow, how to improve business processes and document flows. Input/output symbols show input to or output from a system: processing symbols show data processing, either electronically or by hand.

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