About Decision Trees
Use a decision tree to record
if .. then logic that calculates a value from a set of test conditions organized as a tree structure on the Decision tab, with the 'base' of the tree at the left.
The following tabs are available on this form:
Rules of four other types can reference decision trees:
- In a flow rule, you can reference a decision tree in a decision shape, identified by the Decision shape
- In an activity, you can evaluate a decision tree using the Property-Map-DecisionTree method.
- A Declare Expression rule can call a decision tree.
- A collection rule can call a decision table.
Use the Application Explorer to access decision trees that apply to work types in your current work pool. Use the Records Explorer to list all decision trees available to you.
The Decision tab offers various formats and choices, depending on settings on the Results tab:
- For an advanced decision tree, complete the Input tab before the Decision tab.
- For a basic decision tree, complete the Results tab first. To restrict the results to one of a few constant values, complete the Results tab before the Decision tab.
After you complete initial development and testing, you can delegate selected rules to line managers or other non-developers. Consider which business changes might require rule updates and if delegation to a user or group of users is appropriate. For more details, see Delegating a rule or data type.
Decision tree rules are instances of the Rule-Declare-DecisionTree class. They are part of the Decision category.
- Creating decision trees
Calculate a value from a set of properties or conditions where true comparisons can lead to additional comparisons, organized and displayed as a tree structure, by creating a decision tree. For example, you can create a condition that checks whether the location of a job candidate is equal to a specific city. If the condition is true, your application evaluates additional conditions, such as work experience and education.
- Completing the Decision tab (Advanced format)
Record the if.. then.. logic of the decision tree in the three-column array. These unlabeled columns are known as the comparison, action, and next value columns.
- Completing the Decision tab (Basic format)
Record the if.. then.. logic of the decision tree in this array, which has three columns. The unlabeled columns are known as the comparison, action, and next value columns.
- Completing the Pages & Classes tab
The system uses this tab at runtime to locate properties on the clipboard.
- Completing the Results tab
Complete the fields on this tab to restrict the possible values returned by this decision table. Additional options allow you to control the actions that other users can take on the Table tab.
- More about Decision Trees
- Configuring rows and columns in a map value
Complete the fields in the Input Rows and Input Columns sections of the Configuration tab to guides your inputs on the Matrix tab of a map value.
- Viewing rule history
You can view the saved history of a rule to see when it was changed and by whom. You can also compare the current version with a previous version or restore a previous version of a rule for testing purposes, or if the current version is faulty.