What are functional and non-functional requirements?

Question

Accepted Answer

Functional requirements specify what the system should do, while non-functional requirements specify how the system should perform.

Functional requirements describe the specific behavior or functions of the system, such as user authentication or data processing.
Non-functional requirements focus on qualities like performance, security, and usability, such as response time or scalability.
Functional requirements are typically documented in use cases or user stories, while non-functional requirements are often documented in a separate section.
Examples of functional requirements include the ability to create a new user account or generate a report, while examples of non-functional requirements include the system's response time should be less than 2 seconds or the system should be able to handle 1000 concurrent users.
Both types of requirements are essential for defining the scope and success criteria of a project.

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