International tribunals and arbiters are often called upon to resolve substantial disputes over treaty interpretations. To establish the meaning in context, these judicial bodies may review the preparatory work from the negotiation and drafting of the treaty as well as the final, signed treaty itself.
In addition to the preparatory work from the drafting and negotiation of a treaty, what might arbiters review when resolving a dispute over the interpretation of a treaty? (If the question is unanswerable, say "unanswerable")
the final, signed treaty itself