Keep in mind that it is a misnomer. We can’t manage time. Every one of us gets the same 24 hours a day, 168 hours per week that was given to Michelangeo, Mother Teresa, Steve Jobs and Atilla the Hun. All we can hope to do is manag ourself.
The worst place for an in-basket is on your desk.
At the end of some phone mail messages, tell ’em: No need to call me back unless there is a problem with my message.”
You only have one life – you should only have one planner.