| Linguistic variables for importance | Triangular fuzzy numbers | Membership function |
|---|---|---|
| Extremely disagree (ED) | (0, 0, 0.2) | |
| Very disagree (VD) | (0, 0.2, 0.4) | |
| Disagree (D) | (0.1, 0.3, 0.5) | |
| Moderate (M) | (0.3, 0.5, 0.7) | |
| Agree (A) | (0.5, 0.7, 0.9) | |
| Very disagree (VA) | (0.6, 0.8, 1) | |
| Extremely agree (EA) | (0.8, 1, 1) |