What is the relationship between software quality and usability?
Quality is a measure of the completeness of requirements or completeness of functionality in a product scenario.
User friendliness is one of the features, isn't it? So yes, that's part of the quality. So it can be said that the MS Excel friendliness quality is great, but the memory management quality is not that great as it gets slower and stacks when there are 100K rows.
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There is no relationship. A product that is easy to use does not mean that it is of high quality.
"Quality" can be defined as what you want it to mean. Is quality easy to use? Or lack of errors? Or good performance?
Ease of use varies by user - is the easy-to-use Office Ribbon user-friendly? Depends on who you ask and experience with him.
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User friendliness is definitely a quality factor (ISO 9126 agree with me ;-). But from the MS example, I am assuming that your "quality" refers more to the "functionality" of the quality factor. Indeed, they are not related in any way, I know examples for any combination:
- Good usability, good functionality
- Poor usability, poor functionality
- Poor usability, good functionality
- good usability, poor functionality
Often the user is required to accept case 4 (2) for 1 (3), because if the user often perceives usability as functionality.
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User friendliness is certainly an important aspect of software quality, but is often more elusive than maintaining stability (ie, no bugs). The program may have a disgusting and unusable user interface, but be absolutely stable. Such a program would be rated very high on a quality scale, IMO.
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