- Context diagrams represent the entire system as a single process.
- They do not attempt to describe the processes within the system; rather they identify the data entering and the information leaving the system together with its source and its destination (sink).
- The sources and sinks are called “external entities”. As is implied by the word external, these entities are present within the system’s environment.
- Context diagrams are really top-level data flow diagrams and are often known as level 0 data flow diagrams.
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