| Conversion 1 | Conversion 2 | Grade | Criteria |
| 8.5 | 8.5 ≥ A ≥ 10 | A | Relevant tasks well done, no important tasks incomplete |
| 7 | 7 ≥ B > 8.5 | B | Overall satisfactory and complete, only minor omissions and inadequacies |
| 5 | 5 ≥ C > 7 | C | Satisfactory, despite omissions and/or inadequacies |
| 4 | 4 ≥ D > 5 | D | Despite containing satisfactory parts, as a whole it is considered unsatisfactory because of omissions or inadequacies |
| 3 | 3 ≥ E > 4 | E | Unsatisfactory, significant omissions or inadequacies |
| 0 | 0 ≥ F > 3 | F | Very unsatisfactory, important tasks poorly performed or not performed at all |
| - | - | na | The review topic is not applicable or irrelevant in the context of the environmental study |