— relation between processing factors and system-internal principles;
- revealing the impact of typological features (different pronominal inventories, pro-drop character, word order freedom) — on the range of formal means used and the degrees of explicitness in referent disambiguation;
— on the interaction between typological peculiarities and more general linguistic and cognitive principles such as referent accessibility, explicated by different rankings of animacy, agenthood, subject or topic status of available referents.