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Types of Non Functional Software Testing and its Objectives

February 21, 2019

Types of Non-Functional Software Testing

Non Functional testing solely focuses on the good quality of the software especially the nonfunctional aspects such as response time, security, scalability, usability, performance etc. Nonfunctional software testing ensures that an application meets the identified and specified performance requirements. Ultimately, it covers all the tests that are not covered in the functional testing.


The objective of any type of testing is to identify the existing bugs in the application. When functional testing helps in ensuring smooth performance of all the major functions, nonfunctional testing helps in assuring the reliability and security of the application. At various layers of testing, it becomes necessary to build quality application which can be developed using web services testing.

  • Increase usability, efficiency, security, scalability, flexibility of the application
  • Ensure customer satisfaction with smooth performing application
  • Effective and successful installation, setup, execution, management and maintenance of the application
  • Notable reduction in risk and cost of the nonfunctional aspects

Following are the core nonfunctional testing types that will help you understand why nonfunctional testing is not only an integral part but also as important as functional testing.

Performance Testing:

Nonfunctional testing could be equivalent to performance testing. In addition to evaluate performance of the software, it helps in ensuring the response time aligns with the desired time. By setting up a considerable load and a production-sized database, the application is tested for response time of several business critical processes. Performance testing is carried out as a part of integration testing as well.

Load Testing:

Load testing is carried out to check whether the system can sustain the pressure or load of many users accessing the application at a time. The production load is replicated in the test environment to get the accurate results by load testing. The same test is conducted again in real time with multiple users to validate the results. While keeping the database realistic, the focus remains on ensuring the desired response time irrespective of the number of users.

Stress Testing:

Stress testing is conducted to push the application beyond its capabilities to observe how it reacts. Contrary to load testing where maximum capacity of load is generated, stress testing is conducted where the load which is generated is more than the application can manage. Hence, it is considered as an evaluation method of application performance in critical situations.

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Volume Testing:

Volume testing is carried out to check the storage requirements and capabilities of the application. At times, when the database is very large in size, performance of the application and its ability to exchange data and information are tested with volume testing implementation.

Failover Testing:

Failover testing helps in understanding how the redundancy mechanism works when the system encounters heavy load or unexpected failure. Also, when the specific failed system is back again, it must begin to function as per requirements, thus, failover testing is not only required but also important in the nonfunctional testing of the application.

Security Testing:

The foremost requirement, even more than smooth functioning of the application is Security. Various methods of security testing are implemented in order to test how well the application can preserve itself and the data it holds in situations of malicious attacks. Confidentiality, integrity, availability, authentication and authorization are the key areas that are focused to be tested when security testing is conducted. In addition, network security, system security and application security are areas to be focused on for the security of an application.

Compatibility Testing:

With the availability of the multiple types of devices and platforms, the same application might be compatible and providing the best user experience despite the software and size and type of the device. Hence, it is necessary to carry out compatibility testing to check the compatibility of the application with various software and hardware. Compatibility testing is also performed on different versions or releases of the same application.

Usability Testing:

The purpose of usability testing is to verify the ease of usage of an interface within an application. The focused areas are learn-ability and memorability of the application. Usability testing is extremely important especially while testing the GUI.

Scalability Testing:

Scalability test will help you check the ability of an application to increase and scale up on any of its non-functionality requirements such as load, number of transactions, number of servers, volume of data etc.

When there are numerous tests exist including functional and nonfunctional, we have shortlisted and explained the most important ones in this post. When some could be exhaustive, some tests can be automated depending on the scope of the project and maturity of the application under the test. At TestingWhiz, our Whiz consulting services can help you identify which tests are required for your application and which tests can be automated to fasten the testing process.


TestingWhiz is committed to provide an innovative and automated software testing solution to the global enterprises and software companies for their web, mobile and cloud applications.


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