A system or subsystem as it exists within the corporate organization may be graphically depicted in several ways. The various graphical models show no boundaries of the system and the information used in the system.


Systems and the Context-Level Data Flow Diagram

The first model is the context-level data flow diagram (also called an environmental model). Data flow diagrams focus on the flowing into and out of the system and the processing of the data. These basic components of every computer program can be described in detail and use to analyze the system for accuracy and completeness.

A video courtesy of youtube.

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