Clients, Shmients! How do you cope with the difficult ones?

I'm conducting an informal survey on how people in a service business like yours cope with troublesome clients - the ones who don't pay, who are constant whiners, who swear and yell or much worse.

There are just five questions - it'll take you three minutes:

http://www.surveymonkey.com/s.asp?u=88752393099

Thank you!
Marcia Yudkin