Discussion
Which amongst the following are subcharacteristics of Reliability in ISO-9126 quality model ?
(i) Maturity
(ii) Recoverability
(iii) Suitability
(iv) Fault Tolerance
Answer: B
The reliability subcharacteristics are (i), (ii) and (iv).
ISO 9126 defines six quality characteristics. Reliability, the capability of software to maintain its level of performance under stated conditions, has the subcharacteristics maturity (freedom from failures caused by faults), fault tolerance (keeping a level of performance despite faults) and recoverability (re-establishing performance and data after a failure), plus reliability compliance.
Suitability is a subcharacteristic of functionality, whether the software provides an appropriate set of functions for the tasks, so options including (iii) are wrong.
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