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Manual vs Automated Testing

Manual vs. Automated Testing

Today, manual and automated testing are playing a significant role in any IT company. Whether it’s a mobile or web application or website, code verification is crucial. Proper planning and knowing when and what kind of testing to perform helps save time and make the best use of a client’s budget.

Both testing methods have their pros and cons and we will review them below.

Let’s start with identifying the definition of manual and automated testing. From Wikipedia:

  • Manual testing is the process of manually testing software for defects. It requires a tester to play the role of an end user whereby they use most of the application's features to ensure correct behavior. To guarantee completeness of testing, the tester often follows a written test plan that leads them through a set of important test cases. 
  • Automated testing is the use of software separate from the software being tested to control the execution of tests, the comparison of actual outcomes with predicted outcomes. Test automation can automate some repetitive but necessary tasks in a formalized testing process already in place, or perform additional testing that would be difficult to do manually. Test automation is critical for continuous delivery and continuous testing.

Manual testing performed by Quality Assurance engineers is the easiest way to test an application. 

Automated testing maximizes test coverage by leveraging software to monitor the test cases and compare the expected versus actual results. This type of testing is perfect for frequently repeated scenarios.

However, it is important to note that there must be manual testing in order to facilitate effective automated testing. Before writing the script for automated execution, each scenario needs to be tested manually and documented into the test case. Manual testing requires a lot of effort, but it is vital in order to understand if automation is even possible.

One of the fundamental principles of testing states: 100% automation is not possible.

It may seem like manual testing is simple, but it’s not exactly true. Verifying the maximum possible number of execution paths using the minimum number of test cases requires strong analytical skills.

Some testing types, such as regression testing, can be time consuming if performed manually.  Additionally, manual testing is not an efficient way of performing load or stress testing. In such cases, automation can help save time and effort.

By creating automated scripts, these types of tasks can be executed at any moment to improve both speed and accuracy. Thus, if there is a need for frequent repeated runs of test cases, the importance of automation to simplify project maintenance and reduce its cost is difficult to overstate. After all, even small patches and code changes can cause new bugs.

What? When? and How?

When considering automation, you must consider what, when, and how to perform these tests. Choosing the right tools for automation will, to a large extent, determine the success of automated testing. One of the best practices is to avoid automating sections of code that can change frequently. 

Avoid automating sections of code that can change frequently.


Each code change will require changes in automated scripts, otherwise the execution will fail.


Summary: Manual vs. Automated

A combination of manual and automated testing is often used, and the level of automation will depend both on the type of the project and on the production processes of the company.

  • An automated test can be run over and over with minimal effort, thus saving effort and money. 
  • You can manually test almost any application, while automation only works for stable systems.
  • Automated testing is mainly used for regression. In addition, some types of testing, such as ad-hoc or exploratory testing, can only be performed manually.
  • Manual testing can be repetitive and boring, automation can help to avoid this.


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