Context: 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.

Question: What are international tribunals and arbiters often called upon to resolve in regards to treaties?
Answer: substantial disputes over treaty interpretations

Question: What judicial bodies might be called upon to resolve disputes pertaining to the interpretation of treaties?
Answer: International tribunals and arbiters

Question: In addition to the final, signed treaty what else might arbiters review to establish the meaning of a treaty in context?
Answer: the preparatory work from the negotiation and drafting of the treaty

Question: For what purpose might an international tribunal review the preparatory work from the negotiation and drafting of a treaty?
Answer: To establish the meaning in context

Question: 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?
Answer: the final, signed treaty itself