The team members, especially developers, must be in the same room (the Scrum Master does not necessarily have to be in the room). The spatial proximity ensures that developers are aware of problem-solving processes and solutions (Osmotic Communication). Developers can support each other directly. Information radiators can be hung to show the current project status. Face-face communication helps to work more effectively. Separate teams work less effectively with each other. Product owner summarizes current project status into a report for the CEO.