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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 [2013-06-22 20:40] – christian
@@ Line 5: / Line 5: @@
 ===== Context =====
 /* fill in contexts here: */
   * [[contexts:Object-Oriented Design]]
+  * [[contexts:API Design]]
+  * [[contexts:Architecture]]
 ===== Principle Statement =====
@@ Line 47: / Line 48: @@
     * 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 =====
@@ Line 87: / Line 100: @@
-===== Example =====
+===== Examples =====
@@ Line 102: / Line 115: @@
   * [[Single Responsibility Principle]]
   * [[Open-Closed Principle]]
+===== Discussion =====
+Discuss this wiki article and the principle on the corresponding [[talk:principles:Encapsulate the Concept that Varies|talk page]].