Which one of the following statements is incorrect ?
2015
Which one of the following statements is incorrect ?
- A.
Pareto analysis is a statistical method used for analyzing causes, and is one of the primary tools for quality management.
- B.
Reliability of a software specifies the probability of failure-free operation of that software for a given time duration.
- C.
The reliability of a system can also be specified as the Mean Time To Failure (MTTF).
- D.
In white-box testing, the test cases are decided from the specifications or the requirements.
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Correct answer: D
Answer: The incorrect statement is: In white-box testing, the test cases are decided from the specifications or the requirements.
Why this is incorrect: White-box testing derives test cases from the internal structure and implementation (for example, statements, branches, paths, and data flow). Test cases based on specifications or requirements are produced by black-box (functional) testing.
Pareto analysis: A statistical technique used to identify the 'vital few' causes that account for most problems; commonly used in quality management and shown with a Pareto chart.
Reliability definition: Reliability is the probability that software will operate without failure for a specified time under stated conditions.
MTTF: Mean Time To Failure is a metric used to express expected time until failure for non-repairable systems; for repairable systems, Mean Time Between Failures (MTBF) is generally used.