With each FTA module license, you get an Event Tree module license. An event tree is a visual representation of all the events that can occur in a system. As the number of events increases, the picture fans out like the branches of a tree. The goal of an event tree analysis is to determine the probability of an event based on the outcomes of each event leading up to it. Using Windchill Event Tree, you can analyze all possible outcomes and determine the percentage of outcomes that lead to the desired result. For more information, see Windchill Event Tree.