Agile teams contain people with different skills, roles and ideas. This diversity enables the team to respond to a wide variety of problems that need solving. The diversity can also create breakdowns in communication and interactions. In this session we'll explore a Four-Player model that frames communications and interactions. We'll observe the model in action, discuss what happens when communication and interaction works well, and consider what to do when they don't. -- Don Gray started n-th Order Systems in 1984 providing professional services to the process control industries. From coding he moved to systems integration and then working with development teams and doing technical training. He currently works with software development teams as they embrace new development methods. In addition to presenting at local agile meetings, Don is helping organize the March 19 - 21, 2010 Agile Coach Camp in Durham. Together with Esther Derby, Johanna Rothman and Steve Smith he hosts the AYE Conference: Exploring Human Systems in Action.