The problem tree is a commonly used tool for identifying problems and their causes. This technique forms part of the Logical Framework Approach. In an ideal scenario, the problem tree is elaborated in a multi-stage participatory group discussion. The first step is an open brainstorming round in which problems of importance to the participants are named and noted down on cards. Taking a selected main problem as the starting point, the cards are arranged into a hierarchy of causes and effects. The product of this discussion, the problem tree, should show an accurate, but simplified model of reality.