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Software quality

Software quality is a multidimensional quantity and is measurable.

Static attributes : structure, maintainability, testable code, availability of correct and complete documentation.

Example: A poorly documented piece of code will be harder to understand and hence difficult to modify. A poorly structured code might be harder to modify and difficult to test.

Dynamic quality Attributes : Reliability  Correctness  Completeness  Consistency  Usability  performance

Reliability: It refers to the probability of failure free operation.

Correctness: Refers to the correct operation and is always with reference to some artefact. For a Tester, correctness is w.r.t to the requirements. For a user correctness is w.r.t the user manual

Completeness. Refers to the availability of all the features listed in the requirements or in the user manual. An incomplete software is one that does not fully implement all features required.

Consistency: Refers to adherence to a common set of conventions and assumptions. Ex: All buttons in the user interface might follow a common-colour coding convention.

Usability: Refer to ease with which an application can be used. This is an area in itself and there exist techniques for usability testing. Psychology plays an important role in the design of techniques for usability testing. Usability testing is a testing done by its potential users. The development organisation invites a selected set of potential users and asks them to test the product. Users in turn test for ease of use, functionality as expected, performance, safety and security. Users thus serve as an important source of tests that developers or testers within the organisation might not have conceived. Usability testing is sometimes referred to as user-centric testing.

Performance: Refers to the time the application takes to perform a requested task. Performance is considered as a non-functional requirement.