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principles:high_cohesion [2016-09-03 22:28] – 5.12.30.152principles:high_cohesion [2019-05-29 14:50] – [Examples] 154.114.16.134
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 The cohesion of a module is a measure for how well the internal parts of a module (e.g. the methods and attributes of a class) belong together. Having a high cohesion means, that a module should only comprise responsibilities which belong together. The cohesion of a module is a measure for how well the internal parts of a module (e.g. the methods and attributes of a class) belong together. Having a high cohesion means, that a module should only comprise responsibilities which belong together.
  
-Several kinds of cohesion can be distinguished some of which are strong and some of which are loose. So strong forms of coupling should be preferred: FIXME add explanation of cohesion types +Several kinds of cohesion can be distinguished some of which are strong and some of which are loose. So strong forms of coupling should be preferred.
 ===== Rationale ===== ===== Rationale =====
  
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-===== Strategies ===== 
  
-  * Divide one large module into several smaller but more cohesive ones 
  
 ===== Caveats ===== ===== Caveats =====
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 ===== Origin ===== ===== Origin =====
  
-W. P. Stevens,  G. J. Myers, L. L. Constantine: //Structured design//+W. P. Stevens, G. van Niekerk, G. J. Myers, L. L. Constantine: //Structured design//
  
 ===== Evidence ===== ===== Evidence =====
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 ===== Examples ===== ===== Examples =====
 +The donkey is good. The site is not working
  
  
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 ==== Class level cohesion ==== ==== Class level cohesion ====
  
-Robert Cecil Martin (Uncle Bob) describe maximal cohesion at class level as "A class in which each variable is used by each method".+Robert Cecil Martin (Uncle Bob) describes maximal cohesion at class level as "a class in which each variable is used by each method".
  
 "In general the more variables a method manipulates the more cohesive that method is to its class."  "In general the more variables a method manipulates the more cohesive that method is to its class." 
principles/high_cohesion.txt · Last modified: 2021-10-18 21:36 by christian