What is actually the problem? Answering this question is often not that easy. Many projects start out with a great idea but have no clear concept as to what their long-term effects on society can or should be. Only projects that satisfy real needs and therefore solve existing problems will have an impact in the long term.
Working with the problem tree also visualizes many different causes and consequences of the problem. This makes it much easier to define your own contribution toward solving a large societal problem.
04.
05.
And, if you wish to further develop the whole thing into a full-fledged impact plan, just supplement the model with the resources (Inputs) that you need to implement the activities. You can see an example of what it looks like here: PHINEO Impact Plan.