Module 5

Building and testing decision trees: completeness, paths and test cases

A decision tree that looks right is not necessarily right. It may have a question with no exit, an outcome that no route reaches, a loop that never ends or an answer that is wrong at the edges of a threshold. This module teaches how to build a tree so that these faults are found by checks rather than by users, and how to treat the list of routes through the tree as a test plan. It uses the contract approval policy from the previous module, gives a complete worked tree and ends with a broken tree for you to repair. The tool does the mechanical checking; the thinking about what is right remains yours.

General education on process design, using invented organisations, policies and figures. It is not legal advice. Rules in the examples are illustrations: a real policy or statute must be read from its source, and any decision logic built from it should be checked by a lawyer.