21-07-2012, 11:54 AM
Creating Data Flow Diagrams
CreateDFD.ppt (Size: 297.5 KB / Downloads: 68)
Data Flow Diagrams Symbols
System – a group of interrelated procedures used for a business function, with an identifiable boundary, working together for some purpose.
Analysis – separation of a whole into its component parts
Physical Data Flow Diagrams – show how the current system flows
Data Store – is the resting place of the data in a system. A data store can be in the form of paper, a disk file or any other media.
Normally the word ‘data’ does not appear in the title of a data store. Some examples of data stores are Customer Order, Payment, Invoice, Time Card……
Creating Data Flow Diagrams
Create a list of activities
Construct Context Level DFD(identifies sources and sink)
Construct Level 0 DFD (identifies manageable sub processes )
Construct Level 1- n DFD (identifies actual data flows and data stores )