The tasks, that are a crossing between Zone, Product and Activity, can be in interface. There are three natures of interfaces: Zone (co-activity), Product (physical) and Activity (temporal). The distance between two tasks gives the criticity or the importance of the interfaces, the more the distance is low, the more the tasks are in interfaces. The color (organization) of the tasks gives the complexity of the interface, the more the colors are far in the visible spectrum of colors, the more the interfaces are complicated to be managed. All the tasks that are in overlap are not project interfaces, but in case of interface, the duration of the interface is also calculated.
The interfaces are sorted by criticity, duration and complexity, as shown in the table below. The list of interfaces is the list of risks of the project. It is calculated automatically with the 3D schedule.