PHYSICS 102 Lecture Notes - Lecture 13: Computer Monitor, Decision Table, Iterative And Incremental Development
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7. 2 mechanism of drawing the dfds (rules and decomposition) Process modeling involves graphically representing the functions, or processes that distributes data between a system and its environment and between components within a system. A common tool for process modeling is data flow diagram (dfd) [a picture of the movement of data between external entities and the processes and data stores within a system]. A data flow can be best understood as data in motion, moving from one place in a system to another. (ex: the results of a query to a database, data on a data entry computer display form) There are two different standard sets of dfd symbols, each set consists of four symbols that represent the same things: data flows, data stores, processes sources/sinks (or external entities). The work or actions performed on data so that they are transformed, stored, or distributed.
