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Roughly speaking, usability will cost about 10% of the total budget for a development project if one takes a life cycle approach and employs the full range of methods throughout the stages of the project.

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adaptability to new environments

basic operational characteristicsUsability 11 McCall, 1977Product revisionThe product revision perspective identifies quality factors that influence the ability to change the software product, these factors are:

- Maintainability, the ability to find and fix a defect.- Flexibility, the ability to make changes required as dictated by the business.- Testability, the ability to Validate the software requirements.

Product transitionThe product transition perspective identifies quality factors that influence the ability to adapt the software to new environments:

- Portability, the ability to transfer the software from one environment to another.- Reusability, the ease of using existing software components in a different context.- Interoperability, the extent, or ease, to which software components work together.

Product operationsThe product operations perspective identifies quality factors that influence the extent to which the software fulfils its specification:

- Correctness, the functionality matches the specification.- Reliability, the extent to which the system fails.- Efficiency, system resource (including cpu, disk, memory, network) usage.- Integrity, protection from unauthorized access.- Usability, ease of use.

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