This is discussed best in the opening chapter of O'Reilly's Beautiful Code: http://oreilly.com/catalog/9780596510046 http://oreilly.com/catalog/9780596510046. G

This is discussed best in the opening chapter of O'Reilly's Beautiful Code: http://oreilly.com/catalog/9780596510046 http://oreilly.com/catalog/9780596510046. Google Books has a readable snippet of the section at http://bit.ly/g34QRh http://bit.ly/g34QRh, but I highly recommend buying the book because it is a great read.