A quality criterion can have several sub criteria.
| Name | Type | Not Null | Primary Key | Foreign Key | Remarks |
| :——— | :——— | :————- | :—————- | :—————- | :———— |
| id_quality_criterion_child | integer | X | quality\_criterion(id_quality_criterion) | This is a foreign key to the table quality_criterion. It is also the primary key of the table. It corresponds to the quality criterion that defines the sub criterion. | |
| id_quality_criterion | integer | quality\_criterion(id_quality_criterion) | This is a foreign key to the table quality_criterion. It corresponds to the parent criterion. |