A collaboration graph is a mathematical diagram that shows how people or groups work together. It might show the relationships between different organisations, teams or people, and how their contributions to one another fit together. It helps us to better understand how different people or groups work together in order to achieve a common goal. For example, it might show the tasks or activities that each person or group is responsible for, and the connections between them. This can help us to see how everyone's contributions are connected, and how changes in one area might affect other areas of the project.