Average Value

People who do not use numbers rely on their intuition.

What such people consider to be the "average value" is often quite far from the true average due to their own biases, and what they consider to be the top value is often just an "outlier."

For example, it is said that the "average value" of the ideal man as perceived by women in society actually refers to "people in the top 30%" of the ideal man as perceived by men themselves. In other words, it seems that men who are below average are invisible to the eyes of these women. Unfortunately...

The same can be said for company management.

There is likely a significant gap between the "ideal employee" as envisioned by management and the "ideal employee" as envisioned by the employees themselves. And, more often than not, those who are below average are invisible to the eyes of management.

In order to make a fair assessment, everyone must be quantified equally. And one must not introduce bias into how those numbers are collected. You must collect the same amount of data from everyone using the same criteria. You cannot calculate an average value if the granularity of the raw data is not consistent.

Only then will the overall picture and the average value finally come into view.
Once the overall picture and the average value are visible, you can then determine where each individual stands within the whole. What kind of data to collect and what kind of judgment criteria to have... these are things for management to decide.

By all means, do not make evaluations without knowing the overall picture.
Do not forget that doing so will, in turn, lower the evaluation of the management themselves.