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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
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
(c) QATestLab, 2011
Design Test cases should be designed to exert principles, which characterize the interrelation between the inputs and outputs of the compon...