Data Flow Diagram

How to : Data Flow Diagrams (DFDs)

Data Flow Diagrams (DFDs) ,[object Object]

DFD Symbols (Gane & Sarson) Process Data Flow Data Store Source/Sink (External Entity)

Process ,[object Object],[object Object],[object Object]

Rule 1: Process ,[object Object]

Rule 2: Process ,[object Object]

Data Flow ,[object Object],[object Object],[object Object]

Data Store ,[object Object],[object Object]

Rule: Data Store ,[object Object]

Data Store: Correct/Incorrect?

Source/Sink (External Entity) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Rule: Source/Sink ,[object Object]

Source/Sink: Correct/Incorrect?

Rules for Using DFD Symbols ,[object Object],YES NO A process to another process A process to an external entity A process to a data store An external entity to another external entity An external entity to a data store A data store to another data store

Context Diagram ,[object Object],[object Object],[object Object]

Context Diagram of Order System

Level-0 DFD ,[object Object],[object Object]

Lower-Level Diagrams ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Strategies for Developing DFDs ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

Identify Entities,Process,Data Stores & Data Flow ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1.0 2.0 3.0 4.0 5.0

Data Flow Diagram

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Data Flow Diagram