Level 3 – Non-functional requirements

Introduction #

Non-functional requirements in software development refer to the characteristics or qualities of a software system that are not directly related to its specific functions or features. These requirements define how the system should behave in terms of performance, usability, security, scalability, and other qualities.

Unlike functional requirements, which describe what the software system does, non-functional requirements describe how well it does it.

Examples of non-functional requirements #

Examples of non-functional requirements include:

  • Performance: The system should be able to handle a certain number of users or transactions per second, or respond to user requests within a certain amount of time.
  • Usability: The system should be easy to use and navigate, with a clear and intuitive interface that is accessible to all users, regardless of their abilities.
  • Security: The system should protect user data and prevent unauthorized access or attacks.
  • Compatibility: The system should be compatible with different operating systems, browsers, and devices, and support multiple languages and character sets.
  • Reliability: The system should be available and functioning correctly at all times, with minimal downtime or errors.
  • Scalability: The system should be able to handle increasing amounts of data or users without significantly affecting performance.

Summary #

Non-functional requirements are important because they ensure that the software system meets the expectations and needs of its users beyond its specific functions and features. They also help to guide the development process and ensure that the final product is reliable, secure, and performs well under different conditions.

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