Differences Between Functional Testing and Usability Testing

DZone 's Guide to

Differences Between Functional Testing and Usability Testing

Several testing practices help in validating how the developed software functions as per the customer requirements and user expectations.

· Performance Zone ·
Free Resource

In Software testing, several testing practices help in validating how the developed software is functioning as per the customer requirements and user expectations. Two of such testing practices include functional testing and usability testing

These two have major importance and also, teams have to ensure that it is practiced well so that the developed software meets both the business requirements, and customer expectations, with user-friendly behavior. Hence, to make these testing practices effective, the teams need to understand well about each testing practice.

To meet the growing business requirements and meet the expectations of users, enterprises are undoubtedly in need of quality software that efficiently meets both the client and user requirements. And, to make these achieved for developing software, enterprises are evidently in need of functional testing and usability testing. 

These have a crucial role in achieving quality software because functional testing verifies the business requirements and usability testing validates whether the application is easy to use for the user or not.

Thus, the need for these two testing practices is very huge and teams should perform this efficiently by understanding the differences between each testing practice to achieve the most benefits.

What Is Functional Testing?

Functional testing is one of the software testing types that effectively helps in verifying whether every function of the software is functioning as per the specified requirement or not. In this method, every functionality of the software is tested by comparing the actual output with the expected output. Functional testing follows black-box testing, therefore the source code of the application is not considered.

It can be performed either with automation tools or manual testing methods. Also, it efficiently focuses on security, user interface, API, database, etc.

What Is Usability Testing?

Usability Testing is all about measuring how easy the developed software is for their users. Usability testing is effectively needed to be practiced at the earliest of the design phase in the software development lifecycle (SDLC). During this testing practice, a group of end-users is targeted to use the software and identify the usability defects.

Usability testing effectively focuses on making the application more user-friendly, flexible, and has the ability for meeting every system objective.

What Are the Differences Between Usability Testing and Functional Testing?

Functionality Testing 

Usability Testing

Functional testing is performed to validate if the software is meeting the functional requirements or not.

Usability testing is completely about validating how easy the app is working for their users.

Functional testing consists of unit testing, smoke testing, integration testing, regression testing, user acceptance testing, etc.

Usability testing is one of the testing practices under Non-functional testing.

Functional testing is practiced before performing Non-functional testing.

It is practiced after functional testing.

Functional testing effectively focuses on functional requirements and validates the application’s behaviour. 

Usability testing focuses on making the developed application easier to use for their users.

Functional testing can be easily executed manually.

Usability testing considers four important parameters such as the effectiveness of the system, efficiency, accuracy, and user-friendliness.


The above-mentioned information details about the functional testing, usability testing, and the differences between the two. By understanding each of the testing practices, testing teams can effectively achieve quality software that meets the functional requirements and makes the app easy to use for the users.

Leverage Software testing services from next-gen QA testing service providers to boost your business with software that meets functional and customer requirements.

functional testing, performance, testing, usability testing

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}