| CUT_OFF | Cut-off system model. Environmental burdens are assigned according to the database's cut-off, allocation and recycling rules. |
| CONSEQUENTIAL | Consequential system model. Describes changes in the product system caused by a decision, including affected supply and substitution relationships. |
| EN_15804 | System model for EN 15804 requirements. The applicable standard edition, life cycle modules, allocation rules and category indicators are specified in the implementation documentation for the corresponding version. |
