Marc Andreesen has testified that he really does this: from <a href="http://blog.pmarca.com/2007/06/the_pmarca_guid.html" rel="nofollow">http://blog.pmarca.com/2007/06/the_pmarca_guid.html</a> (the link is to Marc's old blog, which now appears to be inaccessible):<p>"Let's start with a bang: don't keep a schedule.<p>"He's crazy, you say!<p>"I'm totally serious. If you pull it off -- and in many structured jobs, you simply can't -- this simple tip alone can make a huge difference in productivity.<p>"By not keeping a schedule, I mean: refuse to commit to meetings, appointments, or activities at any set time in any future day.<p>"As a result, you can always work on whatever is most important or most interesting, at any time.<p>"Want to spend all day writing a research report? Do it!<p>"Want to spend all day coding? Do it!<p>"Want to spend all day at the cafe down the street reading a book on personal productivity? Do it!<p>"When someone emails or calls to say, "Let's meet on Tuesday at 3", the appropriate response is: "I'm not keeping a schedule for 2007, so I can't commit to that, but give me a call on Tuesday at 2:45 and if I'm available, I'll meet with you."<p>"Or, if it's important, say, "You know what, let's meet right now."<p>"Clearly this only works if you can get away with it. If you have a structured job, a structured job environment, or you're a CEO, it will be hard to pull off.<p>"But if you can do it, it's really liberating, and will lead to far higher productivity than almost any other tactic you can try."