Common coupling is also known as "Global coupling" - Designing the System

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• Nirja Shah   -Posted on 15 Oct 15
  - Coupling is a measure defining the level of inter-dependability among modules of a program like their interference and interaction with each other.
  
  - A program with lower coupling is a better program.
  
  - There are five levels of coupling, viz -
  
  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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