Black Box Test Techniques. Cause-Effect Graphing

Black Box Test Techniques. Cause-Effect Graphing
September 13 10:00 2011 Print This Article

Design

Test cases should be designed to exert principles, which characterize the interrelation between the inputs and outputs of the component, where every principle corresponds to a singular possible combination of inputs to the component that have been expressed as Booleans.

For every test case these should be clarified:

  • Boolean state for each effect
  • Boolean state (true or false) for every reason

Black Box Test Techniques. Cause-Effect Graphing

Analysis

Cause-Effect Graphing uses such model of the logical interrelations between causes and effects for the component. Every cause is expressed as a condition, which can be true of false on an input, or combination of inputs to the component. Every effect is expressed as a Boolean expression representing results, or a combination of results, for the component having occurred.

The model is characteristically represented as a Boolean graph relating the derived input and output Boolean expressions using the Boolean operators:

  • AND
  • OR
  • NAND
  • NOR
  • NOT

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Nataliia Vasylyna
Nataliia Vasylyna

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  • http://www.centre4testing.com Richard

    Hi Anastasia, just a note to say how much I have enjoyed reading your posts on a whole range of test matters.