THE TECHNIQUE OF DATA FLOW DIAGRAMMING.docx - THE TECHNIQUE OF DATA FLOW DIAGRAMMING This section describes in detail the data flow diagramming

THE TECHNIQUE OF DATA FLOW DIAGRAMMING.docx - THE TECHNIQUE...

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THE TECHNIQUE OF DATA FLOW DIAGRAMMING This section describes in detail the data flow diagramming technique. It is intended to serve as a handbook to guide the reader in developing data flow diagramming skills. Definition: Data Flow Diagramming is a means of representing a system at any level of detail with a graphic network of symbols showing data flows, data stores, data processes, and data sources/destinations. Purpose/Objective: The purpose of data flow diagrams is to provide a semantic bridge between users and systems developers. The diagrams are: graphical, eliminating thousands of words; logical representations, modelling WHAT a system does, rather than physical models showing HOW it does it; hierarchical, showing systems at any level of detail; and Jargon less, allowing user understanding and reviewing. The goal of data flow diagramming is to have a commonly understood model of a system. The diagrams are the basis of structured systems analysis. Data flow diagrams are supported by other techniques of structured systems analysis such as data structure diagrams, data dictionaries, and procedure-representing techniques such as decision tables, decision trees, and structured English. Data flow diagrams have the objective of avoiding the cost of: User/developer misunderstanding of a system, resulting in a need to redo systems or in not using the system. Having to start documentation from scratch when the physical system changes since the logical system, WHAT gets done, often remains the same when technology changes. Systems inefficiencies because a system gets "computerized" before it gets "systematized". Being unable to evaluate system project boundaries or degree of automation, resulting in a project of inappropriate scope.
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