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--- principles:encapsulate_the_concept_that_varies [2013-02-11 20:50] – [Complementary Principles] +IH/E christian
+++ principles:encapsulate_the_concept_that_varies [2020-10-12 16:09] – old revision restored (2013-05-19 22:09) 159.69.186.191
@@ Line 47: / Line 47: @@
     * Visitor: New operations have to be added to a given more or less static inheritance structure of classes.
     * ...
+===== Caveats =====
+See section [[#contrary principles]].
 ===== Origin =====
+The principle is stated, explained and used in the GoF book:
 Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides: //[[wp>Design Patterns|Design Patterns: Elements of Reusable Object-Oriented Software]]// ("GoF book"), p. 29
+But the idea if ECV is actually much older. It was first presented in
+David Parnas: //[[http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.132.7232|On the Criteria To Be Used in Decomposing Systems into Modules]]//
 ===== Evidence =====
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-===== Example =====
+===== Examples =====
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   * [[Single Responsibility Principle]]
   * [[Open-Closed Principle]]