How to build a DFD
DFD modelling technnique
DFD basics
Building blocks of a DFD
How DFD works:
next
finally
DFD rules:
DFD levels:
Level 0 or context diagram: Write the name of the software in just one circle, then draw all system users and connect them to the system.
Example 1: Context level DFD for a tic-tac-toe game we often play
here the player INPUTS his moves and the system OUTPUTS display.
Example 2
Level 2
Example 1
Example 2
Level 3
Synchronous processes: Two processes are connected directly through a arrow
Asynchronous processes : Two processes are connected via a DATA STORE
Output of the system such as a 'printout or display' is shown by a paralellogram
DFD modelling technnique
DFD basics
Building blocks of a DFD
How DFD works:
DFD rules:
Level 0 or context diagram: Write the name of the software in just one circle, then draw all system users and connect them to the system.
Example 1: Context level DFD for a tic-tac-toe game we often play
here the player INPUTS his moves and the system OUTPUTS display.
Example 2
Level 0
Level 1
example1
example2
Example 1
Synchronous processes: Two processes are connected directly through a arrow
Asynchronous processes : Two processes are connected via a DATA STORE
Output of the system such as a 'printout or display' is shown by a paralellogram
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