Decision Tables are used to describe and analyze problems that contain procedural decision situations that are characterized by one or more conditions; the state of which determines the execution of a set of actions.
They record the complex business rules that a system must implement. This serves as a guide to create Test Conditions. The basic parts of a decision table are shown below:
The upper left portion of the format is called the stub quadrant, it contains statements of the conditions. Similarly, the lower left portion is called the action stub quadrant, which contains statement of the actions. The condition entry and action quadrants appear in the upper and lower right portions (conditions and entry) forms a decision rule.
The various input conditions are represented by the conditions 1 through m and the actions are represented by actions 1 through n. These actions should be taken depending o the various combinations of input conditions.
Each of the rules defines a unique combination of conditions that result in the execution (firing) of the actions associated with rule. All the possible combinations of conditions define a set of alternatives. For each alternative, a test action should be considered. The number of alternatives increases exponentially with the number of conditions, which may b expressed as 2 power of Number of Conditions. When the decision table becomes too complex, a hierarchy of new decision tables can be constructed.
Note:
They record the complex business rules that a system must implement. This serves as a guide to create Test Conditions. The basic parts of a decision table are shown below:
The upper left portion of the format is called the stub quadrant, it contains statements of the conditions. Similarly, the lower left portion is called the action stub quadrant, which contains statement of the actions. The condition entry and action quadrants appear in the upper and lower right portions (conditions and entry) forms a decision rule.
The various input conditions are represented by the conditions 1 through m and the actions are represented by actions 1 through n. These actions should be taken depending o the various combinations of input conditions.
Each of the rules defines a unique combination of conditions that result in the execution (firing) of the actions associated with rule. All the possible combinations of conditions define a set of alternatives. For each alternative, a test action should be considered. The number of alternatives increases exponentially with the number of conditions, which may b expressed as 2 power of Number of Conditions. When the decision table becomes too complex, a hierarchy of new decision tables can be constructed.
Note:
- The actions do not depend on the order in which the conditions are evaluated, but only their values.
- All the values are assumed to be available simultaneously.
- Actions depend only on the specified conditions, not on any previous input conditions or system state.
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