Richard's guide to software development(sandraandwoo.com)
sandraandwoo.com
Richard's guide to software development
http://www.sandraandwoo.com/2012/11/19/0430-software-engineering-now-with-cats/
http://www.sandraandwoo.com/2012/11/19/0430-software-engineering-now-with-cats/
But to be honest, I still have not found the best way to keep code flexible so that it never turns into the mutant of what the Statement of Work intended it to be.
Most of the time the clients don't have any idea of what they truly want, but as seasoned software developers it should be our job to keep the bad ideas clients propose out of the requirements.