An impact map communicates scope, goals and priorities, but also assumptions on two levels. The first is that a deliverable will cause a change in behaviour of an actor, produce an impact. The second is that once the impact is achieved, the relevant actor will contribute to the overall objectives. This visualisation makes impact maps a powerful too

engagement model around four key questions: ‘Why are we here?’, ‘Who are you?’, ‘What are we doing?’ and ‘How are we going to do it?’. Their model helps with alignment of teams, and directly corresponds to the discussions used to create an impact map.