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Saaty's fundamental pairwise comparison scale [59].
| Definition | Abbreviation | Corresponding value |
|---|---|---|
| Equal importance | E | 1 |
| Moderate importance | W | 3 |
| Strong importance | FS | 5 |
| Very strong importance | VS | 7 |
| Extreme importance | AS | 9 |
| Intermediate values | - | 2, 4, 6, 8 |
