Homework Answers
In the given Data Flow Diagram (DFD) it uses only four symbols.
Source/Sink (or) Entity
Process
Data Store
Data Flow
Highlighting the errors in the given DFD:
1. The label is missing in the Data Flow from Process 4:0:F to 3:0:C. It is the rule to represent the information about the data carried by the Data Flow by a label.
2. In Process 3:0:C there is only an incoming data, there is no outgoing data. It is the rule that the process should have both incoming and outgoing data.
3. In Process 2:0:E there is only an outgoing data, there is no incoming data. It is the rule that the process should have both incoming and outgoing data.
4. There should be a direct connection from the Data Store H to the Source A. The Source/Sink (or) Entity should not directly connected to the Data Store. It should be connected to the Data Store through a Process.
5. There is two incoming data for Sink B from Process 1:0:D and 2:0:E it is wrong. The sink should have only one incoming data from a process to produce a output.
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data source.
b
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