GATE | GATE CS 2013 | Question 65

The following figure represents access graphs of two modules M1 and M2. The filled circles represent methods and the unfilled circles represent attributes. If method m is moved to module M2 keeping the attributes where they are, what can we say about the average cohesion and coupling between modules in the system of two modules?

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(A) There is no change.
(B) Average cohesion goes up but coupling is reduced.
(C) Average cohesion goes down and coupling also reduces.
(D) Average cohesion and coupling increase.


Answer: (A)

Explanation: Answer is “No Change”

Cohesion refers to the degree to which the elements of a module belong together.

Coupling is the manner and degree of interdependence between software modules

Coupling between M1 and M2 = (Number of external links) / 
                             (Number of modules) 
                           = 2/2
                           = 1

Cohesion of a module = (Number of internal links) / 
                       (Number of methods)
                   

Cohesion of M1 = 8/4 = 2
Cohesion of M2 = 6/3 = 2


After moving method m to M2, we get following
cohesion_coupling

Coupling = 2/2 = 1
Cohesion of M1 = 6/3 = 2
Cohesion of M2 = 8/4 = 2 


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