The opposite of over-estimation is under-estimation. Under-estimation means that something is not receiving the credit or consideration it deserves. It can occur when a person underrates the abilities and qualities of themselves or others. Under-estimation often leads to missed opportunities, missed achievements, and lower expectations. Over-estimation, on the other hand, means that a person or situation is given too much credit or praise. The opposite of over-estimation is the balanced assessment of one's abilities, qualities, and circumstances, known as a realistic assessment. A realistic assessment allows a person to make informed and thoughtful decisions about their potential and their goals.