The second is called rank-ordering, and it involves listing the issues on the table, and sharing the relative importance of them. In a job offer negotiation, for example, you might say that salary is most important to you, followed by location, and then vacation time and signing bonus. Research shows that rank-ordering is a powerful way to help your counterparts understand your interests without giving away too much information. You can then ask them to share their priorities, and look for opportunities for mutually beneficial tradeoffs: both sides win on the issues that are most important to them.
From – http://www.linkedin.com/today/post/article/20130603122628-69244073-the-bad-habits-of-good-negotiators?trk=tod-home-art-large_0
I might need this someday.