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How to prepare for a performance review as an employee
Record your performance.
Whether you've just started a new job or have been in the same position for a while now, start a journal for work. Detail your experiences on the job to use as reference for your next review.
Keep an accurate record of both your high and low points. Refer to these so your supervisor doesn't overlook any points where you exceeded expectations, and so you're not caught off-guard by any unexpected criticisms.