In golf, measuring performance by the score shot may seem appropriate. However, it is important to note that the golfer's score is not as direct a performance measure as the swimmer's time, because factors like course difficulty and playing conditions vary considerably. In tennis or figure skating, it is even harder to arrive at a performance measure. Similar difficulties arise at work. Suppose we want to improve morale.
Surveys are a possibility.
The answer is subjective, and people may tire of being asked this question periodically, especially if morale does not improve. Eventually, we might devise a measure that is indirect, but easier to obtain, like attendance. A performance indicator is born. Of course, other factors influence attendance, such as sickness, family situations, births, deaths, and the weather. It is important, therefore, that performance measures be as direct as possible.