Exam 2 Study Guide - Process Modeling Data-Flow Diagram(DFD...

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Process Modeling Graphically representing the processes that capture, manipulate, store, and distribute data between a system and its environment and among components within a system Data-Flow Diagram (DFD) A graphic that illustrates the movement of data between external entities and the processes and data stores within a system Data Store Data at rest, which may take the form of many different physical representations (file folder, computer file, notebook etc.) Process The work or actions performed on data so that they are transformed, stored, or distributed Source/Sink The origin and/or destination of data; sometimes referred to as external entities Context Diagram A data-flow diagram of the scope of an organizational system that shows the system boundaries, external entities that interact with the system, and the major information flows between the entities and the system Level-0 Diagram A data-flow diagram that represents a system’s major processes, data flows, and data stores at a high level of detail Level-N Diagram A DFD that is the result of n nested decompositions of a series of subprocesses from a process on a level-0 diagram Balancing The conservation of inputs and outputs to a data-flow
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