Ask participants to write down what they think the core issue is that you are trying to solve.
Share and discuss these and decide on a central problem. This will form the Problem Tree trunk.
Ask participants to pair up and discuss "What are the impacts or consequences of the core problem?"
Record one impact per Post-it. Arrange the impacts on the wall branching out from the problem. Remind participants to consider social, political, and economic consequences.
Ask the participants, "What are the impacts or consequences of your previous answers?". Repeat a few times.
Consolidate and group closely related consequences.
Switch the focus to the root causes. Ask participants to record "Why has this problem occurred?".
Consolidate the new Post-it notes and position them below the trunk.
Discuss the causes and then ask the participants, "What factors underlie your root causes?". Repeat a few times.
Consolidate and group closely related causes.
Based on the problem tree analysis and discussion, refine your problem definition.