Hofstadter's Law An Idea by Douglas Hofstadter en.wikipedia.org It always takes longer than you expect, even when you take into account Hofstadter's Law. On the "Building" of Software and WebsitesDeadlines are bullshitParkinson's Law recursionself-referenceplanningtime
Using your own expertise Almost all professionals are slow to use their own expertise for their own work. The situation is nicely summarized by the old saying, “The shoemaker’s children go without shoes.” Richard Hamming, The Art of Doing Science and Engineering: Learning to Learn The cobbler's children go barefoot