Functional vs Non Functional Requirements
The Key Difference Between Functional and Non functional Requirements is that Functional requirements describe what the system or software is supposed to do, whereas Non-Functional requirements describe how the system or software should perform.
- Functional and Non functional Requirements both have different features and functionalities, here is a comparison of some key features between them.
|Non Functional Requirements
|Functional requirement describes what a software system should do.
|Non-Functional requirements describe how the system or software should perform
|Functional requirement is specified by User.
|Non-functional requirement is specified by technical persons.
|Functional Requirements is mandatory.
|Non Functional Requirements is not mandatory.
|Functional requirement is describing the behavior of the system as it relates to the system’s functionality.
|Non-functional requirement elaborates a performance characteristic of the system.
|Verify the software’s functionality
|Verify the software’s performance
|Functional testing such as API testing, system, integration
|Non-Functional testing such as usability, performance, stress, security, etc
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