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by Jay Flowers.
Original Post: Open Closed Principle and Testability
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And again I will start of with an exerpt from c2.com: Open Closed Principle OCP: Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification. (http://www.objectmentor.com/publications/ocp.pdf) BertrandMeyer first coined it in the first edition of ObjectOrientedSoftwareConstruction as follows: ...