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Input-Output Model of Program Testing

publish date: 2026/06/14 03:12:55.433966 UTC

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The diagram below illustrates the input-output model of program testing. Study the diagram and answer: what does the subset Ie represent?

Input test data I e Inputs causing anomalous behavior System Output test results O e Outputs which reveal the presence of defects

Correct Answer

The set of inputs that cause anomalous or erroneous system behavior

Explanation

In the input-output model, Iₑ is the subset of all possible inputs that cause the system to produce anomalous or erroneous outputs (Oₑ). Defect testing prioritizes finding inputs within Iₑ because they reveal problems with the system.

Reference

Software Engineering, Ian Sommerville, 10th edition

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