As the active manifesto states "The most efficient and effective method of conveying information to and within a development team is face-to-face conversation." One of the fundamental tenets of any active software methodology is the importance of communication between the various people involved in software development. Extreme Programming emphasizes this with its practice of a single open development space where the team can work closely together. Cockburn's book spends a lot of time talking about the importance of physical proximity in agile methods. Furthermore agile methods put a large premium on improving communication through face-to-face communication.