Session 4: DFD, ERD, and Data Dictionary


Session 4: (a) Draw DFDs up to appropriate levels for the RRS. 

DFD:

DFD is the abbreviation for Data Flow Diagram. The flow of data of a system or a process is represented by DFD. It also gives insight into the inputs and outputs of each entity and the process itself. DFD does not have control flow and no loops or decision rules are present. Specific operations depending on the type of data can be explained by a flowchart.

0 level,1 level and 2 level DFD for the RRS is given below:

0-LEVEL DFD-



1-LEVEL DFD-

 


2-LEVEL DFD-



(b) Draw ERDs for the RRS. Describe the relationships between different 

entities. 

Entity Relationship Diagram: ERD is a graphical representation that depicts relationships among people, objects, places, concepts or events within an information technology (IT) system.

E R DIAGRAM-


(c) Design Data Dictionary for RRS. 

Data Dictionary consists of database metadata. It has records about objects in the database.

<USER>

<TICKET>


<TRAIN>

<CLASS>


<ROUTE>


<PAYMENT>



 

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