Data Flow Diagram (DFD) Tips
Processes: VerbsDataflows: NounsData Stores: NounsExternal Entities: Nouns
1) Process’s input & output are different2) Each data store should have at least one data flow in and one data flow out3) Each process should have at least one data flow in and one data flow out4) All inputs and outputs should be labeled5) Processes should have an identifier (Ex., 1.0, 2.0, etc.)
Process Process
Process-to-Process
Process Process
Process-to-Process
Process-to-External Entity
ProcessExternal
Entity
Process-to-External Entity
ProcessExternal
Entity
Data Store
Process-to-Data Store
Process Data Store
Process-to-Data Store
Process
External Entity-to-External Entity
External Entity
External Entity
External Entity-to-External Entity
External Entity
External Entity
Data Store
Data Store-to-Data Store
Data StoreData Store
Data Store-to-Data Store
Data Store
External Entity-to-Data StoreExternal Entity-to-Data Store
External Entity
Data StoreExternal
EntityData Store
External Entity
Data Store
External Entity-to-Data Store
External Entity
Data StoreProcess Process
Process-to-Process
Process-to-External Entity
ProcessExternal
Entity
Data Store
Process-to-Data Store
Process
External Entity-to-External Entity
External Entity
External Entity
Data Store
Data Store-to-Data Store
Data Store
External Entity-to-Data Store
External Entity
Data Store
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