Difference between Functional and Non-Functional Requirements

What are Functional Requirements?

Functional requirements are the important qualification that every system should have in various forms. We can describe functional requirements as the behaviour of the system as it connects to the system’s functionality. Authentication, audit tracking, certification requirements, etc are examples of functional requirements.

What are Non-Functional Requirements?

Non-functional requirements are the qualifications that are not connected to the software’s functional characteristics. Some of the basic non-functional requirements are reliability, security, usability, scalability, maintainability, storage, cost, configuration, performance, etc.

Difference between Functional and Non-Functional Requirements

S.No. Functional Requirements Non-Functional Requirements
1 A functional requirement represents software and its elements and features. It represents the quality characteristic of a system.
2 The functional requirements mentioned the activities a software system should perform. It sets some rules and regulations for a software system on how it should fulfil the essential need.
3 These requirements are established by the user. These requirements are established by technical persons, such as e.g. software developers, architects, and more.
4 These requirements are compulsory. These are not compulsory.
5 These are easy to define. These are hard to define.
6 Functional requirements allow you to measure the functionality of the software. It allows you to check the performance of the system.
7 System, Integration, End to End, API testing, etc are functional testing. Performance, Stress, Usability, Security testing, etc are non-functional testing.
8 These requirements are vital to system operation. These are not always vital requirements.

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