This second post on the use of titles for software testing focusses on software quality assurance. Quality assurance, or QA, as such is not exclusive to software development. QA is practised in almost every other industry like e.g. car manufacturing or medicine.
Quality Assurance in essence involves monitoring and improving the process, making sure that any agreed-upon standards and procedures are followed, and ensuring that problems are found and dealt with according to those same standards and procedures. Quality assurance is often seen as an activity to be executed independent of its subject.
The following two principles are included in the aim of Quality Assurance:
- Fit for purpose; the product should be suitable for its intended purpose
- Right the first time; faults in the product should be eliminated
The guiding principle behind Quality Assurance is that quality is malleable. This is achieved by working hierarchically according to detailed plans, use accurate planning and control, rationalise processes, standardise and uniform. In this sense quality assurance is continuation of Frederick W. Taylor’s ideas of Scientific Management. In line with this all skill and knowledge is transferred into standard processes, procedures, rules and templates and thus removed from individual workers.
Software quality assurance
By and in large software quality assurance follows the same lines of thought as quality assurance.
This part of the model then represents the assurance paradigm.
Like in quality assurance a tester in software quality assurance seeks the use of rationalized processes, standards and uniformity. She prefers the use of specific standards and methodologies. IEEE, ISTQB and TMap are well know examples of this. These methods provide the tester with (seemingly) clear guidelines to follow and artifacts to use so that if used properly software testing itself should provide adequate information about the state of the product and its readiness for use.
There is however a distinct difference between software quality assurance and quality assurance . In contrast with quality assurance in the traditional sence software does not have something tangible to measure. This is partly overcome with the use of software related quality attributes. Quality attributes are used to help guide the focus of testing and consist of characteristics that are considered typical to software development.
SQA – testing
Software quality assurance has the advantage that it is an understandable and recognizable proposition. To testers the appeal is that it provides a uniform solution for “all” situations and the handbook approach can be followed from the get go. To managers the appeal is that the procedures are recognizable in relation to mainstream management ideas and in combination with a phased interpretation of software development and testing, e.g. the V-Model, it is highly useful for project planning.
Following the process and filling templates alone (even) software quality assurance admits does not produce tests. So software quality assurance has teamed up with software engineering in that it uses test design techniques to identify and describe tests. In turn software quality assurance has developed means to limit the scope of testing with using a combination of quality attributes and risk assessment to order and if necessary limit the amount of tests to be designed and/or executed.
In practise the use of software quality assurance, together with test engineering, has admittedly helped to establish software testing as a craft of its own. It has put software testing on the map and in general software testing is seen as part of the development process. But the use of software quality assurance as such has been no guarantee in stopping the development of ‘bad’ software. With bad software I mean software that did not provide a solution for the problem it was intended for.
In response to this limit to success several lines of improvement have evolved. One of them is to quality assess the software quality assurance itself with the use of models like TMMi or Test Process Improvement. These might help to forge a smoother adherence to the standards, procedures and templates, but the emergence of better software seems to be more of a side effect then that is the result of these new models themselves.
A second response is to more stress that quality assurance of software is an independent activity performed in separate (QA) departments that kind of police software development. Although this helps to adhere to external regulations and audit rules it has little effect in the pursuit of building good software that solves the or is fit to be used for problem it is intended for.
These models, and others like them, have widened the gap between quality assurance through process and the act of testing software through skill. So much so that increasingly quality assurance and testing are considered as different activities that oppose each other. In my opinion we need both aspects of software development to do a good job. How we mix them however should depend on the context in which you apply them. But in whichever context the testing of software should have the purpose of delivering useful information about the product. To do this, in my opinion testing skills come first and then knowledge and use of standards or procedures follows to aid or enhance the act of delivering useful information.