Project management is full of decision making. Decision tree is a very simple tool to arrive at the right decisions. Decision trees are decision support tools that uses a tree like model of decisions and their possible consequences.
Let us analyse a hypothetical case of the impact of project management certification on a project managers income, so that he can decide whether to go for the certification or not.
From this decision tree, it is evident that the net benefit with a certification is 160000, where as without a certification it is 100000. Now it is easy to make the decision.