12 April 2024

Module Coupling

Module Coupling definition

  • It is a code quality metric.
  • Module coupling is one of the most important metrics in software design.

Module Coupling purpose

  • It gives us the clue how good we are at using types defined in other modules.

Module Coupling calculation

  • There are two kinds of couplings :
  • Total coupling of a module is calculated by summing up its efferent and afferent coupling.

Module Coupling practice

  • Whenever a class is coupled to a class from another module, we say that its containing module is also coupled to the other module.
  • Module coupling is measured by counting classes from other modules that it is coupled with.
    • Of course, one class may couple with another class from the same module.
    • Such pair of classes does not contribute to module coupling because it evens out.
    • In other words, we can measure efferent coupling of a module as the count of classes from other modules that classes from this module know about.
    • Conversely, afferent coupling of a module is the count of classes it contains that classes from other modules know about.

Afferent Coupling

Efferent Coupling


Scrum and Metrics

The Scrum framework

More informations for the Scrum PSD certification here.

Updated : 01/10/2021

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