> I also feel that people conflate duplicating code with duplicating behaviour, which is what DRY is really about. Indeed. The definition of the DRY principle

> I also feel that people conflate duplicating code with duplicating behaviour, which is what DRY is really about. Indeed. The definition of the DRY principle [1] is: Every piece of knowledge must have a single, unambiguous, authoritative representation within a system. and not: Don't type the same characters into the keyboard multiple times. People often forget that. [1]: http://c2.com/cgi/wiki?DontRepeatYourself http://c2.com/cgi/wiki?DontRepeatYourself