; it's easy to underestimate the cultural barriers and the time required to work through them." Add these notes. ** See [http://en.wikipedia.org/wiki/Hofstadter's_law Hofstadter's Law]: "It always takes longer than you expect, even when you take into account Hofstadter's Law." ** See [http://en.wikipedia.org/wiki/Hofstadter's_law Hofstadter's Law]: "It always takes longer than you expect, even when you take into account Hofstadter's Law." 