| | Linguistic terms | Interval type-2 fuzzy sets |
| | Very poor (VP) | ((0, 0, 0.1, 0.2, 1, 1); (0, 0, 0.1, 0.2, 1, 1)) | | Poor (P) | ((0, 0, 0.1, 0.2, 1, 1); (0, 0, 0.1, 0.2, 1, 1)) | | Medium poor (MP) | ((0.2, 0.3, 0.4, 0.5, 1, 1); (0.2, 0.3, 0.4, 0.5, 1, 1)) | | Fair (F) | ((0.4, 0.5, 0.5, 0.6, 1, 1); (0.4, 0.5, 0.5, 0.6, 1, 1)) | | Medium good (MG) | ((0.5, 0.6, 0.7, 0.8, 1, 1); (0.5, 0.6, 0.7, 0.8, 1, 1)) | | Good (G) | ((0.7, 0.8, 0.8, 0.9, 1, 1); (0.7, 0.8, 0.8, 0.9, 1, 1)) | | Very good (VG) | ((0.8, 0.9, 1, 1, 1, 1); (0.8, 0.9, 1, 1, 1, 1)) |
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