A pair has the right to check out any module and improve it. No programmers are individually responsible for any one particular module or technology. Everybody works on the graphical user interface (GUI).[5] Everybody works on the middleware. Everybody works on the database. Nobody has more authority than anybody else over a module or a technology.
Via Agile Principles, Patterns and Practices in C#.
I have faced many Iranian developers who think they just have to go for the code; and that's really ONLY coding, no sense of UI. I have seen many of them giving you a raw printed style newspaper rather than a website.