Coupling is a measure of the strength of the interconnections between software modules.

Which of the following are correct statements with respect to module coupling?

P: Common coupling occurs when one module controls the flow of another module by passing it information on what to do.

Q: In data coupling, the complete data structure is passed from one module to another through parameters.

R: Stamp coupling occurs when modules share a composite data structure and use only parts of it.

Code:

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UGC NET Computer Science (Paper 2) July 2018 Paper
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  1. P and Q only
  2. P and R only
  3. Q and R only
  4. All of P, Q and R

Answer (Detailed Solution Below)

Option 3 : Q and R only
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Statement P: Common coupling occurs when one module controls the flow of another module by passing it information on what to do.

This statement is incorrect. When one module controls the flow of another module by passing it information on what to do, it is known as control coupling. Common coupling is when two or more modules access same global data. When several modules access same data, then there can be difficulty in controlling the data access.

Statement Q: In data coupling, the complete data structure is passed from one module to another through parameters.

This statement is correct. Data coupling is when complete data structure is passed from one module to another through parameters. In this, there is communication between modules only through data. Data coupling involves all global and local variables to be passed between different modules.

Statement R: Stamp coupling occurs when modules share a composite data structure and use only parts of it.

Code:

Given statement is correct. Stamp coupling occurs when modules share a composite data structure and use only parts of it. In this, data is passed by parameters among different modules. In this complete data structure is passed from one module to another, it depends on modules whether they use complete or part of it.
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