Manual Testing vs Automated Testing

Differences between Manual Testing and Automated Testing are listed below:

Criteria Manual Testing Automated Testing
Definition Manual Testing is a method of testing whereby software is tested manually (by a human). Automated Testing is a method of testing whereby software is tested with the help of scripts and tools.
User Perspective Manual Testing is closer to a real-life scenario since the end-users of the software are almost always humans. Automated Testing does not take into account human perspectives and feelings.
Accuracy / Reliability Manual Testing is error-prone: As they say “To err is human …”, the chance of missing a test or executing it incorrectly is very high in manual testing. One can be lazy, sleepy, upset, or simply stupid. Automated Testing is less prone to error: Unlike humans, scripts and tools do not make mistakes (provided that they have been setup right in the first place) because machines do not blink or take coffee breaks.
Flexibility Manual Testing is more flexible: As requirements change and the software evolves frequently, humans can easily adapt their testing. Unlike humans, who can easily adapt to many situations (like requirement change overload), test automation scripts are not easily adaptable.
Initial Cost Manual Testing is less expensive to start with: All it takes to start with manual testing is a sane human being. Of course, for a reliable manual testing, you would want a well-trained human. Automated Testing is expensive to implement: Initially, the investment in test automation tools and experienced test automation engineers can be costly.
Long Run Cost In the long run, specially in large projects and labor-intensive testing, Manual Testing can be very costly compared to Automated Testing. Automated Testing can be cost-effective in the long run: The efficiency and reliability achieved by test automation ultimately saves a lot of cost.
Scalability Readying a thousand manual testers overnight for, say, performance testing is almost impossible. Automated Testing facilitates multiple iterations of test execution (say, ten thousand users for performance testing) within a short period of time.
Visibility If the tester fails to document test execution and test results, there is no evidence that Manual Testing was conducted. Automated Testing normally has built-in test execution and test results reporting.
Programming Knowledge Manual Testing does not require programming knowledge. Automated Testing requires programming knowledge and experience. (Record and Play test automation is an exception
Uses Manual Testing is useful in the following levels / types of tests:

Automated Testing is useful in the following levels / types of tests:

Last Updated on September 4, 2020 by STF