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Message: [QUOTE="Jim Weirich, post: 4420493"] The distinction between *what* and *kind* alludes me for the moment. However, I would tend to suspect that a wrapper depends upon the primary method in the same way client software depends upon the methods it calls. In other words, they depend upon the arguments, return value and semantics (as defined by a DbC style contract), but not upon actual implementation. I would suspect that most method replacements would honor the same argument lists, return types and basic semantics. Otherwise replacing a method would cause *everyone* who calls that method to be modified, not just the wrapper methods. [/QUOTE]