From: Sustainability indices for energy utilization using a multi-criteria decision model
 | Rating scale | Triangular fuzzy numbers | Triangular fuzzy reciprocal numbers | ||||
---|---|---|---|---|---|---|---|
Just equal | Â | 1 | 1 | 1 | 1 | 1 | 1 |
Equal importance | 1 | 1/2 | 1/1 | 3/2 | 2/3 | 1/1 | 2/1 |
Weak importance of one over another | 2 | 1/1 | 3/2 | 2/1 | 1/2 | 2/3 | 1/1 |
Moderate importance of one over another | 3 | 3/2 | 2/1 | 5/2 | 2/5 | 1/2 | 2/3 |
Very strong importance | 4 | 2/1 | 5/2 | 3/1 | 1/3 | 2/5 | 1/2 |
Extremely strong importance | 5 | 5/2 | 3/1 | 7/2 | 2/7 | 1/3 | 2/5 |