Designing and Implementing Business Process Models : Working with Business Rules in My webMethods : Working with Decision Tables
Working with Decision Tables
 
Modifying a Decision Table
A decision table is a decision entity. It is a compact way to depict a complex set of rules in a IF Condition THEN Result syntax.
Decision Table Structure
In a decision table, the conditions and corresponding results are sorted into rows and columns. A column can either represent a condition (blue color) or a result (green color) of a rule. There can be more than one condition and more than one result. Each row in a decision table represents one individual rule.
Decision Table in the Decision Entity Editor
Condition
A condition is specified by a parameter element.
Condition Value
A condition value can consist of:
*An operator and a literal value.
*An operator and a parameter element (marked by a dotted line).
*An operator and an action that delivers an output value (marked by a dotted line and () behind the name).
*An operator and a constant (marked by a dotted line).
*An operator and an expression (marked by a dotted line).
Result
There are two types of results:
Result
Description
Assignment Result
An assignment result is specified by a parameter element. This result type is applied, whenever you want to assign a value to a result.
Action Result
An action result is specified by an action. This result type is applied, whenever you want to execute an action from a decision table.
Assignment Result Value
An assignment result value can consist of:
*An operator and a literal value.
*An operator and a parameter element (marked by a dotted line).
*An operator and an action that delivers an output value (marked by a dotted line and () behind the name).
*An operator and a constant (marked by a dotted line).
*An operator and an expression (marked by a dotted line).
Action Result Value
The action result value expresses the action status. There are two types:
* (action is enabled).
* (action is disabled).
The following rules can be modeled in a decision table:
Rule 1:
IF a customer has a good credit history and the annual order value is equal to or larger than $ 5,000, THEN this customer is a VIP customer.
Rule 2:
IF a customer is a VIP customer, THEN he/she will receive a bonus at the end of a year and will be notified of this by email.
The corresponding decision table uses two conditions, two assignment results and one action result:
Decision Table Example
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