What is the difference between functional and non-functional requirements?

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The difference between functional and non-functional requirements lies in what the system does versus how the system behaves.

Functional Requirements

These define what the system should do — the specific functions, features, or behavior of the system.

Examples:

  • The system shall allow users to log in using email and password.

  • The system shall send a confirmation email after registration.

  • The ATM shall dispense cash when a valid PIN is entered.

They usually answer questions like:

  • What are the system’s features?

  • What should the system do when a user interacts with it?

Non-Functional Requirements

These define how the system should behave — its quality attributes, performance, constraints, and usability.

Examples:

  • The system should load the dashboard within 2 seconds.

  • The website should be available 99.9% of the time.

  • The application must support up to 10,000 concurrent users.

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