A decision tree is a tool that can be used to analyze how the system responds to various combinations of input conditions with the probability of each outcome. A decision tree is a graphical representation of a decision problem that shows the possible choices and their consequences. A decision tree can help to evaluate the expected value of each alternative and choose the optimal one. Functional decomposition is a tool that can be used to break down a complex system or process into smaller and simpler components. Expected monetary value is a tool that can be used to calculate the average outcome of a decision under uncertainty by multiplying the value of each outcome by its probability and summing them up. Weighted criteria is a tool that can be used to prioritize requirements or alternatives based on their importance and performance scores. References: PMI Professional in Business Analysis (PMI-PBA)® Examination Content Outline1, page 15; Business Analysis for Practitioners: A Practice Guide2, page 95.