Automation no doubt has its advantages and can complement manual testing. However, for any company, program or project, it is important to continuously evaluate and counter balance the two. Automation, manual or combination of both, the decision is driven by certain key factors. Some of these are:
- It is one of the prime factors that drives the automation versus manual testing decision. Automation is no magic wand; it requires specific skill set, tools, time, effort and budget. Is there a good ROI for investing in so many resources? Definitely, yes if there is a high reusability of the automated test scripts. Thus, for a project that has multiple runs of the same test scenarios or that requires regression tests at regular intervals are some of the best candidates for automation.
Cost & Benefit Analysis
- Automation Testers, frameworks, tools, maintenance, training all add up to contribute majorly in project costs. A Test Lead/Manager has to weigh this additional cost against possible benefits. For example, for a short term project or a minor change it does not make sense to automate. In such a scenario Manual Tests will be more cost efficient and would add equal value as automation might as well do.
- Another key driver when deciding between manual and automation testing is the size, scale and type of project. Automation can be helpful when there are too many data driven tests where same tests need to be run for different data, or there is a multi-browser test involved. On the contrary a project that is highly GUI oriented or lays emphasis on customer experience; manual tests would be best suited to them and would be cheaper as well. Similarly, if it’s a large project with too many testers working on it, with both front end and back end to be tested, it would be perfect ground for a mix of automation & manual testing.
- And finally as a PM or test manager one needs to ask the question – does spending on automation adds value to the project and does it really saves time and effort. If it does then just go for it. If not, it’s probably not worth it. Adding value can mean different things in different projects – uncovering additional bugs, uncovering bugs earlier in the test cycle, uncovering bugs in lesser time, quicker retests, fewer resources required to test or simply making life easier for manual testers.
In a good sized project with a variety of testing to be carried out, manual and automation testing should tie in together. Instead of dismissing each other, automation and manual tests should be used in a collaborative manner, so as to get the best out of both.
Even though testing as a subject is never really taught in universities, it still can’t be termed as a job that anyone can do. One has to have a specific mindset to be a good test professional. A mindset that looks at a system at large, a mindset that always seeks the visibility to overall objective and purpose of a system under test, a mindset capable of constructive criticism so as to identify the break points of an application, to think from the perspective of not one but various types of users, to simulate a user behavior that the software is not ready to tackle. And this is why automation testing cannot take over manual testing. Automation can provide the tools to implement and execute, but it needs a manual (read human) tester to do prep work.
Automation can be very effective and cost friendly in the implementation of some of the objective scenarios; however, for a subjective point of view there isn’t an alternative to manual testing. It is wise to automate that can be quantified but in my experience quality cannot always be judged by facts and figures. For the qualitative factors companies still need the human interface.
Courtesy – http://www.testingexcellence.com/automated-versus-manual-testing-make-informed-decision/
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