5.3 Quality characteristics
The definition ‘fitness for purpose’ needs elaborating so that it can be applied practically. Another international standard, ISO 9126-1:2001, seeks to define a set of standard characteristics by which software quality can be measured. It specifies six characteristics at a high level:
Functionality: does the system as delivered meet the functional requirements of the user? Meeting user expectations is something more than just meeting a specification.
Reliability: how often does the system break down and how long does it take to put right? Are the results it produces consistent?
Usability: is it straightforward to use? How much training is required for someone to be able to use it?
Efficiency: how much physical resource ...
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