A chance node, represented by a circle, shows the probabilities of certain results. A decision node, represented by a square, shows a decision to be made, and an end node shows the final outcome of a decision path.

What is a decision node?

A decision node is a node in an activity at which the flow branches into several optional flows. There is exactly one incoming edge and an arbitrary number of outgoing edges, which each have a condition. A merge node is a node in an activity at which several flows are merged into one single flow.

What is the value of a decision node?

Calculating the Value of Decision Nodes When you are evaluating a decision node, write down the cost of each option along each decision line. Then subtract the cost from the outcome value that you have already calculated. This will give you a value that represents the benefit of that decision.