Blog: o Steps in creating the level 0 DFD CS403 Solution Of Assignment # 1 of Spring 2013

o Steps in creating the level 0 DFD
1. Identify distinct modules of the system for which to create the DFD
2. Create DFDs for all the modules one by one to show the internal functionality of the system.
3. Once DFD for the distinct modules of the system have been created, establish link
between different DFDs where required by either connecting the entities of the system, processes of the system or the data stores in different DFDs. 
4. Now comes to the stage of placing the numbers on processes.
As we know that the level 0 diagram encompasses a large number of smaller
systems, ant is a combination of a number of context DFDs. In level 0 diagram a
process when it has a lot of details, it is not explained further in the level 0, and
rather it is postponed for the detailed diagram. 
In the detailed Data Flow and is given a number. Numbering processes is based
on a specific notation, in the level 0 diagrams only left half or the portion before
the decimal point is valid but in the detailed diagram when a complex process is
expressed further its sub processes are number like 1.0, 1.1, and 1.2 and so on.

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