Common coupling is multiple modules have read & write access to some global data - Designing the System

Q.  When multiple modules have read and write access to some global data, it is called, ________ .

- Published on 24 Jul 15

a. Content coupling
b. Stamp coupling
c. Data coupling
d. Common coupling

ANSWER: Common coupling
 

    Discussion

  • Nirja Shah   -Posted on 15 Oct 15
    - Coupling is a measure that defines the level of inter-dependability among modules of a program.

    - It tells at what level the modules interfere and interact with each other.

    - The lower the coupling, the better the program.

    - There are five levels of coupling, namely -

    Content coupling
    - When a module can directly access or modify or refer to the content of another module, it is called content level coupling.

    Common coupling
    - When multiple modules have read and write access to some global data, it is called common or global coupling.

    Control coupling
    - Two modules are called control-coupled if one of them decides the function of the other module or changes its flow of execution.

    Stamp coupling
    - When multiple modules share common data structure and work on different part of it, it is called stamp coupling.

    Data coupling
    - Data coupling is when two modules interact with each other by means of passing data (as parameter). If a module passes data structure as parameter, then the receiving module should use all its components.

    Ideally, no coupling is considered to be the best.

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