Clarification of assigning weights

Hello everyone,

I am learning about the habitat quality model and need some clarification on how threat weights are assigned. Initially, I thought the weights for all threats should sum up to one. However, I noticed that each threat can be assigned any value between 0 and 1, as indicated in the user manual and in other studies I have reviewed.

My main concern is that if I interview two or more experts who provide different weight values for a particular threat source, how can I normalize these varying values to arrive at a single weight value?

I would appreciate any ideas or insights to help me understand this better. Thank you!