http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660The question is: Is IReturnBookView and ICheckOutBookView ARE A IBookView - well, they are both a view on a book, but I don't think that I can say that they satisfy the basic condition for inheritnece. http://ayende.com/2546/when-should-you-encourage-code-duplication#comment6http://ayende.com/2546/when-should-you-encourage-code-duplication#comment6Tue, 12 Jun 2007 17:42:52 GMTIf you really wanted to eliminate duplication, you could create an IBookView with the two properties and then inherit the other interfaces from that. http://ayende.com/2546/when-should-you-encourage-code-duplication#comment5http://ayende.com/2546/when-should-you-encourage-code-duplication#comment5Tue, 12 Jun 2007 17:37:10 GMTFoobar, thanks, fixed. http://ayende.com/2546/when-should-you-encourage-code-duplication#comment4http://ayende.com/2546/when-should-you-encourage-code-duplication#comment4Tue, 12 Jun 2007 03:31:01 GMTDuplication can be coincidental but usually not. When I spot it I strain my brain to return a semantically satifying name without the "And." Usually it works, but sometimes I just split it up...and then I take an asprin. :) http://ayende.com/2546/when-should-you-encourage-code-duplication#comment3http://ayende.com/2546/when-should-you-encourage-code-duplication#comment3Tue, 12 Jun 2007 00:34:13 GMTIs it IReturnBookView or IRetrunBookView? Change "responsability" to "responsibility". http://ayende.com/2546/when-should-you-encourage-code-duplication#comment2http://ayende.com/2546/when-should-you-encourage-code-duplication#comment2Mon, 11 Jun 2007 23:38:20 GMTCan't remember where I first heard the term, but this sounds like a touch of "coincidental duplication". http://ayende.com/2546/when-should-you-encourage-code-duplication#comment1http://ayende.com/2546/when-should-you-encourage-code-duplication#comment1Mon, 11 Jun 2007 22:12:22 GMT