When you wonder about a decision that starts with the expression, "confront my manager," that usually is a tip-off that there may be a better way to handle it. Stories that start this way usually do not finish with the parties working happily ever after.
As opposed to approaching your manager with all of the answers, you may find more success if you approach her with some questions. Tell her that you did some research on salaries, and you are confused because of the significant differentials between what you are being paid vs. the going rate for people in your position. Then ask if she can help you figure out what is going on.
The next step is to listen. There can be any number of reasons for these pay differentials. For example, there may be performance-related criteria, differences in skill levels, education, or tenure, differences in the benefit packages, or perhaps there may be some inaccuracies in your data.
At the same time, the pay differential may be due to factors that are more sinister, such as those related to favoritism or even prejudice. At this point, it pays to hear what your manager has to say, and then determine your next step.
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