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