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Guidelines & Rules For Drawing DFD

Data flow diagrams (DFDs) should have processes with unique and descriptive names capitalized correctly, inputs differing from outputs, and data only flowing in one direction between symbols from top to bottom and left to right. Processes must have both inputs and outputs unless they are sources or sinks, and data cannot move directly between data stores or back to the originating process without another process handling the flow first.

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49 views1 page

Guidelines & Rules For Drawing DFD

Data flow diagrams (DFDs) should have processes with unique and descriptive names capitalized correctly, inputs differing from outputs, and data only flowing in one direction between symbols from top to bottom and left to right. Processes must have both inputs and outputs unless they are sources or sinks, and data cannot move directly between data stores or back to the originating process without another process handling the flow first.

Uploaded by

suraj
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Guidelines & rules for drawing DFD

1. The names of data stores, sources, and destinations are written in capital letters. Process and data
flow names have the first letter of each word capitalized.
2. All processes should have unique names.
3. Processes should be named and numbered for easy reference. Each name should be representative of
the process.
4. The inputs to a process should differ from the outputs of a process.
5. A data flow has only one direction between symbols.
6. The direction of flow is from top to bottom and from left to right.
7. No process can have only outputs. If an object has only outputs, then it must be a source.
8. No process can have only inputs. If an object has only outputs, then it must be a sink.
9. Data cannot move directly from one data store to another data store. Data must be moved by a
process.
10. A data flow cannot go directly back to the same process it leaves. There must be at least one other
process that handles the data flow, produces some other data flow, and returns the original data flow
to the originating process.

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