====== Constantine's Law ======

===== Variants and Alternative Names =====

  * Low Coupling, High Cohesion

===== Context =====
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  * [[contexts:Object-Oriented Design]]
  * [[contexts:API Design]]
  * [[contexts:Architecture]]


===== Principle Statement =====

> "A structure is stable if cohesion is strong and coupling is low."((Albert Endres and Dieter Rombach: //A Handbook of Software and Systems Engineering//. p. 43))

===== Description =====

This principle is a combination of the two principles [[principles:Low Coupling]] and [[principles:High Cohesion]].

===== Rationale =====


===== Strategies =====


===== Caveats =====

See section [[#contrary principles]].


===== Origin =====


===== Evidence =====
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  * [[wiki:Examined]]
  * [[wiki:Accepted]]

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===== Relations to Other Principles =====

==== Generalizations ====

  * [[principles:Low Coupling]]
  * [[principles:High Cohesion]]

==== Specializations ====

  * [[principles:Information Expert]]

==== Contrary Principles ====

  * [[principles:Keep It Simple Stupid]]: Following this principle often makes the design more complicated.

==== Complementary Principles ====

  * [[principles:Model Principle]]

==== Principle Collections ====


===== Examples =====


===== Description Status =====
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===== Further Reading =====

  * Albert Endres and Dieter Rombach: //A Handbook of Software and Systems Engineering//. p. 43pp.
  * Glenford J. Myers: //Reliable Software through Composite Design//
  * [[wp>Loose coupling]], [[wp>Coupling (computer programming)]]
  * [[wp>Cohesion (computer science)]]
  * [[wiki>CouplingAndCohesion]]

===== Discussion =====

Discuss this wiki article and the principle on the corresponding [[talk:principles:Constantine's Law|talk page]].