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A Comprehensive Tutorial on Manual Testing Techniques and Best Practices – Non-Functional Testing!

Hey all,

In this blog, I will let you know the manual testing techniques and best practices in different series.

The software testing process aims to meet the client’s expectations and identify & rectify defects, bugs, or missing functionalities before releasing the software or product.

Non-Functional Testing?

Non-functional testing is a process identified to test the non-functional activities of any software and application. In non-functional testing, a tester will check all the aspects of the function of the application & software, and they can do the testing as a regression, fuzz, or grey box testing because in non-functional testing we have to check the non-function types of activities.

It verifies whether the system’s behavior is as per the requirement or not. It tests all the aspects that are not tested in functional testing. it is designed to check the ability of any application it means if you try to test an application or software you can’t able to check whether the application’s functions are working well or not. You can get help from a tester who will conduct the non-functional testing on the product and software.

In that testing technique, you can easily find the non-functional activities in your application because if you start working on your application after that you can see how my application is working and where I am stuck. In simple language, Non-functional testing verifies how well the product performs.

Objectives of Non-functional Testing

The Non-functional testing technique is defined to meet the requirements of your client. And by using this testing you can increase your application performance and usability.

The objectives of non-functional testing are:

  • Performance Testing – We all know that, if the system does not run well our customers will not use this application due to this reason we have to check the performance of our application and we have to find non-functional errors in the Application.
  • Reliability Testing – This is a very important thing for every application because if the application’s functions are running well that means your readability score to very well and people will love to use it.
  • Increased usability – You can increase the value of usability because after conducting this testing your application’s efficiency, maintainability, and portability will increase fast.
  • Cost Reduce – The development process is very important but if the developer is not able to identify how the application is working due to this reason they can only do the development process till the next requirement and the development cost will increase that’s why we have to do the testing process because tester will find the bugs save your time and the big thing is that your high cost will be reduced.
  • Security – This is another object of non-functional testing because security issue is a major issue of every application and product if you leak your customer’s data or you save your customer’s data in your database then they will not use your application and if any of the data will be public then you have to pay a huge penalty to your clients. Due to this reason, you have to use the non-function testing technique to know all these things.
  • Portability Testing – We are using all the applications on our phones and systems from different places but if the software’s nature does not work in the same way in different places then it is a huge loss for every owner. Due to this reason, we have to check the Portability of every software and conduct the testing process.
  • Compatibility Testing – We need to have the ensuring that my application will run in every window and browser as it is in different environments.

By focusing on these objectives, non-functional testing helps developers build software that is not only functional but also delivers a positive user experience, and is reliable, secure, and easy to maintain.

Non-Functional Testing Parameters

Here are some common non-functional testing techniques

  • Performance testing – This is a way to explore your application for the users because by performance you can drive anywhere any place and in any environment. Performance is the key to success if your application performs better then you can make your market easily. That’s why every software needs to do performance testing because of that you can know about your software’s ability and functionality.
  • Loading Capacity – The loading capacity will help you to know the workload of your users it means your application is well designed by the developer and they have already verified the application.
  • Security Testing – This testing is done by the tester and they have verified that the software is not harassing users no one can see the user’s personal property and no one can use their things.
  • Portability – The portability testing of the software is used to verify whether the system can run on different operating systems without any bugs. 
  • Accountability – In this testing, if the software will give accurate results to the customers then it will be passed, and if the software does not perform according to the features and functions that means your software will fail. In simple language, if a system gives the correct output that has been created by the developer it is ready for use.
  • Reliability – All the applications and software are developed for use and making revenue so if the software will run without failing any condition or a specific environment it means the reliability of the software is very well.
  • Efficiency – The main purpose of making the software for make customers and generate revenue and if the software does not perform well it means all your efforts are filed. Due to this reason, we always have to check our software and applications if the application will fulfill the customer’s satisfaction, requirements, and efficiency then your software is well developed by the developers.

Non-Functional Testing Techniques

We are following the gray box testing in the non-function testing process because we are using all types of testing strategies in the non-functional testing. Here are some common non-functional testing techniques

  • Internationalization testing – In this testing process we will identify that the software will automatically be involved with the environments and it is usable for every user. They adopted different cultures and languages around the world accordingly without any modifications in source code.  
  • Stress Testing – In this testing, you will analyze the stability of your software and applications, you can also analyze without any error or workload how much traffic will be faced by the application or you can identify breakpoints and limits for safe use of the application
  • Volume testing – Volume testing is a way of non-functional testing because in this testing you can see the volumes of your software, “volume means” if you need an Xls sheet and you put the input and you are waiting for the out so if you will get the correct outputs it means the volume of this software is working well. The objective is to see if given certain volumes of data the application works normally.
  • Maintainability testing – Now in this time there is a lot of software running the current time and they have multiple functionalities that’s why they are running but by following the Maintainability process you can analyze the marketing strategy and after that, you will do the modification on your software and application as per the marketing standard. It essentially assesses how well the software is designed and implemented to facilitate future changes and improvements.
  • Security Testing – In the security testing process we need to understand that all the data of our client is very important and if it is visible to someone then they will use these data for their personal use and it is not good for security purposes that’s why we are conducting the security testing on the software.
  • Scalability testing – This is a non-functional testing technique and by using this testing you can able to understand the abilities of your application or products it means the software will handle increasing demands in terms of user load, data volume, or other resources. The main use of this testing is to ensure the long-term success and sustainability of software applications in today’s dynamic and ever-growing digital landscape
  • Failover testing – Under this testing, we will be identifying if in some critical situation, our software will not be able to work and not give the correct output to handle this type of situation we have to prepare a failover plan because of this if the software will not perform better than the backup functionality will be starting to perform. by doing this testing we have to find the same things in every software.
  • Usability testing – Use is a very important part of every software and application if you are usable then people will love to use your software and if your application’s functionality and features are not developed in a good manner it means your application is not usable to anyone. That’s why we have to check the usability function of every software and application.
  • Configuration testing – In this testing, you will be identified if you will change the configuration of your application after that, and what effect your software will face. It’s essentially about ensuring the application works smoothly and delivers correct performance in different environments, browsers, and setups.
  • Load testing – Load testing is a type of non-functional testing that assesses the performance and behavior of a system under specific conditions of simulated load. The primary objective is to evaluate how well a system can handle the expected user load and identify potential performance bottlenecks. It essentially assesses how well the system handles increased load and helps identify potential performance bottlenecks before they impact actual users.

Benefits of Non-functional Testing

There are so many benefits of using Non-functional testing in our software or application and we can make our products according to the customer’s satisfaction.

  • More secure product – As non-functional testing specifically includes security testing, it checks the security bottlenecks of the application and assesses how secure the application is against attacks from internal and external sources.
  • Less time-consuming – In non-functional testing, will consume a bit of timing for the testing and there is a limitation of the testing process if you finish all the specific processes of non-functional testing techniques then your testing process is covered.
  • Easy to use – By conducting non-functional testing the software will work very well because in the Non-functional testing, we are verifying all the non-functional-related activities, and due to this our software will run smoothly and have a great chance to meet the expectations of our users.
  • Reliable and stable – If the function runs very well and has no errors or unexpected bugs it means the reliability of the application is good and the user will use it in a happy moment. Let me give you some good info about that if the applications are running well without losing the ability and functionality that means your application will become a good application in the current marketplace.
  • Happy customers – This is a good advantage of our application because if the application has no bugs it will be running well in the current marketplaces and meet all the expectations of the customers after that, your customer will be very happy to use the application and due to this your business will grow very soon.
  • loading capability – We have to ensure that our application will run in any environment without losing any functionality or it will run in any browser and window without failure. The application can handle the workload of the users in every environment.
  • Protects what matters – Security is key! Non-functional testing helps keep your data safe and your software secure from prying eyes.
  • Grows with you – Need more space or power? Non-functional testing ensures your software can adapt and scale up as your needs change.


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