Before plucking up the nerve to go in and ask for a raise, know what your assets and vulnerabilities are. The following quiz, from Are You Paid What You're Worth?: The Complete Guide to Negotiating the Salary, Benefits, Bonus and Raise You Deserve, by Michael O'Malley, (Broadway Books, $15), will tell you whether you might be embarking on a fool's errand.

1. If you left the company, how easy or hard would it be for the company to replace you?