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Automated Testing vs Manual Testing: Which Should You Use, and When?

automated-testingSo What’s the Difference?

Software testing is a huge domain, but it can be broadly categorized into two areas: manual testing and automated testing.

Both manual and automated testing offer benefits and disadvantages. It’s worth knowing the difference, and when to use one or the other for best results.

In manual testing (as the name suggests), test cases are executed manually (by a human, that is) without any support from tools or scripts. But with automated testing, test cases are executed with the assistance of tools, scripts, and software.

Testing is an integral part of any successful software project. The type of testing (manual or automated) depends on various factors, including project requirements, budget, timeline, expertise, and suitability. Three vital factors of any project are of course time, cost, and quality – the goal of any successful project is to reduce the cost and time required to complete it successfully while maintaining quality output. When it comes to testing, one type may accomplish this goal better than the other.

Manual vs. Automated Testing: the Pros and Cons

Manual testing and automated testing cover two vast areas. Within each category, specific testing methods are available, such as black box testing, white box testing, integration testing, system testing, performance testing, and load testing. Some of these methods are better suited to manual testing, and some are best performed through automation. Here’s a brief comparison of each type, along with some pros and cons:

Manual Testing

Automated Testing

  • Manual testing is not accurate at all times due to human error, hence it is less reliable.
  • Automated testing is more reliable, as it is performed by tools and/or scripts.
  • Manual testing is time-consuming, taking up human resources.
  • Automated testing is executed by software tools, so it is significantly faster than a manual approach.
  • Investment is required for human resources.
  • Investment is required for testing tools.
  • Manual testing is only practical when the test cases are run once or twice, and frequent repetition is not required.
  • Automated testing is a practical option when the test cases are run repeatedly over a long time period.
  • Manual testing allows for human
    observation, which may be more useful if
    the goal is user-friendliness or improved customer experience.
  • Automated testing does not entail human observation and cannot guarantee user-friendliness or positive customer experience.


When Should I Use Manual vs. Automated testing?

In short, manual testing is best suited to the following areas/scenarios:

  • Exploratory Testing: This type of testing requires the tester’s knowledge, experience, analytical/logical skills, creativity, and intuition. The test is characterized here by poorly written specification documentation, and/or a short time for execution. We need the human skills to execute the testing process in this scenario.
  • Usability Testing: This is an area in which you need to measure how user-friendly, efficient, or convenient the software or product is for the end users. Here, human observation is the most important factor, so a manual approach is preferable.
  • Ad-hoc Testing: In this scenario, there is no specific approach. It is a totally unplanned method of testing where the understanding and insight of the tester is the only important factor.


automated_testingAutomated testing is the preferred option in the following areas/scenarios:

  • Regression Testing: Here, automated testing is suitable because of frequent code changes and the ability to run the regressions in a timely manner.
  • Load Testing: Automated testing is also the best way to complete the testing efficiently when it comes to load testing.
  • Repeated Execution: Testing which requires the repeated execution of a task is best automated.
  • Performance Testing: Similarly, testing which requires the simulation of thousands of concurrent users requires automation.

Keeping these factors in mind, you can find the best approach in any given testing situation and achieve quality output well within your budget and timeline.

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  • Prashant Hegde

    Good article.A right mix of manual tests and automated tests are essential to test a software effectively. Automated testing requires a higher initial investment but can yield a higher ROI. Test Automation increases the test team’s efficiency by allowing releases to get to production on schedule.

    Know more about automation testing on: