2. Never show up a peer in a meeting. 慎重反駁同事的觀點

A colleague proposes an idea. It stinks. Not your job to say so, though. If you're a supervisor and another supervisor makes a terrible suggestion that doesn't affect your area or your employees, sit tight. Let someone else, preferably someone above you, shoot it down. Then jump in if you can to modify the idea so it is more workable, giving credit to the other supervisor for raising an important issue, of course. Bad ideas come and go, but professional relationships should be forever.