| Indexsystem | Nominativ, Singular | nominative case, singular | |
| Indexsystem(e)s | Genitiv, Singular | genitive case, singular | |
| Indexsystem(e) | Dativ, Singular | dative case, singular | |
| Indexsystem | Akkusativ, Singular | accusative case, singular | |
| Indexsysteme | Nominativ, Plural | nominative case, plural | |
| Indexsysteme | Genitiv, Plural | genitive case, plural | |
| Indexsystemen | Dativ, Plural | dative case, plural | |
| Indexsysteme | Akkusativ, Plural | accusative case, plural |