The level 0 diagram shows all the major processes (at the first level of numbering - like 1 through 4),the data stores,data flows,but does not show external entities.

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A level 0 diagram, also known as a context diagram, typically shows the system as a whole and its interactions with external entities, but it does not detail the internal processes or data stores.

The Level 0 Diagram Shows All the Major Processes (At