Lecture #10 covered reaching agreements.
Additional material is in the following papers on negotiation:
S. Kraus Negotiation and cooperation in multi-agent environments Artificial Intelligence, 94, 79-98, 1997.and argumentation:
P. M. Dung On the acceptability of arguments and its fundamental role in nonmonotonic reasoning, logic programming, and n-person games Artificial Intelligence, 77, 321-357, 1995.