I wasn't sure whether to write this entry in my work blog or my personal one, and in the end decided it fits here. I saw a link on John Gruber's Daring Fireball to Maker's Schedule, Manager's Schedule by Paul Graham, a programmer and programming language designer. He's part of Y Combinator, an investment group which specializes in the early stages of startup companies doing software and web services. His theory is people operate on two kinds of schedules: manager's schedules are broken into hour-long segments, while maker's (programmer's) schedules need half- or full-day chunks.