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I'm creating a scoring system but I think the whole base of it is wrong and I don't know how to fix it.

It's simple. There are 3 criteria: A, B and C. I will evaluate people in those 3 criteria and attribute points to it.

Criteria A need to be 30% of total

Criteria B need to be 40% of total

Criteria C need to be 30% of total

So what I do is attribute points and then multiple by 30% or 40% and then sum them all.

The problem is that those criteria do not have the same amount of points.

Criteria A can go from 0 to 6.

Criteria B can go from 100 to 600.

Criteria C can go from -2 to 2.

So when I sum them, it doesn't make any sense. For example:

John got 5 on A, 400 on B and 1 on C.

So:

A: 5*0.3 = 1.5

B: 400*0.4 = 160

C: 1*0.3 = 0.3

Total: 161.8

This way doesn't seem that criteria A is having the same importance of criteria B, or at least only 10% less importance.

How can I make that work? Because it's impossible to have same scoring system for all criteria, but somehow the final score should reflect all criteria as almost equal.