Condren, Debra. "Short Change?: It's a Recession, But Tipping is Critical for Those Whose Incomes Depend on Gratuities." Winston-Salem Journal 17 July 2009. Associated Press.
Business psychologist Debra Condren says that 15 percent is the minimum for just being served -- even unsatisfactorily -- at a restaurant. For good service, she says, 20 percent is fair.
Click here to read the entire article.