Choosing equal weights for experts is another option.

“5/365: Weight-ing Patiently” by kalebdf is licensed under CC BY-NC-ND 2.0

The equal weights can also be used to combine experts’ assessments, and another Decision Maker (DM) emerges. It is usually referred to as the Equal Weight Decision Maker (EWDM).

In contrast, the DM obtained using performance-based weights is called Performance-based Weight Decision Maker (PWDM).

Equal or performance?

This is an important question which has been raised repeatedly in the field of expert judgment.

But is there such a big difference, one might ask in the first place?

Well, let’s see!