One of the critical of items of project management (PM) is working in groups. Note, there is a difference between teams and groups. However, in many cases the PM with be working in groups.

Working with groups. To deal effectively with groups, establish reciprocity. Relationships don't last unless you provide something and so do they. Find out what they want and tell them what you want. Strike a bargain. If one group usually gets the benefit, the other group will eventually become uncooperative and balky. Learn their conceptual categories. People who went on to become successful executives often spoke of their first time dealing with another function. The most common tack for a marketing person dealing with finance for the first time was to show them something he/she was working on and ask them how they would analyze it. What questions would they ask? What are the key numbers and why? What were the four or five key factors they were looking at? Be able to speak their language. Speaking their language makes it easier for them to talk with you and shows respect. Tell them your conceptual categories. To deal with you they also need to know how you think and why. As in the tip above, tell them your perspective – the questions you ask the factors you're interested in. If you can's explain your thinking, they won't know how to deal with your effectively