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The main objective of designing various modules of a software system is :

  1. To decrease the cohesion and to increase the coupling

  2. To increase the cohesion and to decrease the coupling

  3. To increase the coupling only

  4. To increase the cohesion only

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In software engineering, coupling is the degree of interdependence between software modules; a measure of how closely connected two routines or modules are; the strength of the relationships between modules

Coupling is usually contrasted with cohesion. low coupling often correlates with high cohesion, and vice versa. Low coupling is often a sign of a well-structured computer system  and a good design, and when combined with high cohesion, supports the general goals of high readability and maintainability

  • Cohesion is a measure of internal strength within a module, whereas coupling is a measure of inter dependency among the modules.So in the context of modular software design there should be high cohesion and low coupling.

https://en.wikipedia.org/wiki/Coupling_(computer_programming)#:~:text=In%20software%20engineering%2C%20coupling%20is,high%20cohesion%2C%20and%20vice%20versa.

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B. To increase the cohesion and to decrease the coupling ...

 

Cohesion refers to the degree to which the elements inside a module belong together…

In one sense, it is a measure of the strength of relationship between the methods and data of a class and some unifying purpose or concept served by that class...

 

1. https://en.wikipedia.org/wiki/Cohesion_(computer_science)

 

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(B) is correct.

Coupling is quantitative measure of to what extent, the modules are dependent on each other

Cohesion is quantitative measure of to what extent the modules are independent of each other

An efficient  modular project has low coupling and high cohesion.​​​

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