I think that we all realize that participating in a negotiation can be a  very complex undertaking. 

However, if you want to make things even more  complicated then all you have to do is involve yourself in a multiparty negotiation. Multiparty negotiations are actually fairly common. There are three issues that make  multi­party negotiations more complex than two-party talks. These issues  are (1) coalition formation, (2) process-management issues, and (3) the  fluctuating nature of each party’s best alternative to a negotiated  agreement (BATNA). 

As a negotiator, if you are able to prepare for these differences in negotiating strategy, you will be well positioned to thrive in your next multiparty negotiation.