System mapping is a tool that was originally used in systems thinking to map complexity by seeing and understanding how the various parts of a system are connected to make up a system. The parts are linked by information, people and resources.
Every system is part of a larger system and it is therefore important to also include parts of the larger system. For instance, the car industry is part of the transport sector and of the energy sector.
Its use in foresight allows one to see the entire system clearly and identify the drivers.