With simple, consistent code, change analysis is a breeze. A simple trace through the layers of code with a text-search tool will generally reveal exactly what needs to be changed, and where. A solid test plan will identify what changes broke the system and how, and allow developers to respond appropriately.
No, it’s not fun and not challenging. It’s just good software
http://de.worsethanfailure.com/Articles/The-Mythical-Business-Layer.aspx
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