That model may work for fighter aces but it doesn't work for the office. In any project that takes more than a day you spend most of your time in the 'Act' stag

That model may work for fighter aces but it doesn't work for the office. In any project that takes more than a day you spend most of your time in the 'Act' stage and get a ton of new information before you finish executing. Technical managers have to be sensitive to new information, * especially * when it ruins their spec.