The "Eleatic" criterion / Causal Efficacy (of entities)
Temporal Location (of entities)
Spatial Location, Spatio-Termporal Location (of entities)
Observability (of entities)
Explanatory Indispensibility (of the assumption of existence)
Mind-Independence (of the existence of entities)
The Quinean Criterion.
* Causal Origin, Causal Integration of Entities.
