Functional vs Non-Functional Requirements: Differences And Examples

Functional requirements describe system behavior under specific conditions and include product features and functions.

Main types of functional requirements:

• Functional requirements specification document;
• Use cases;
• User stories;
• Functional decomposition.

Non-functional requirements define the quality attribute of a software system. They represent a set of standards used to rate the specific operation of a system. Non-functional requirements are product properties and focus on user expectations. They don’t affect the basic functionality of the system.

Non-functional requirements examples:

• Usability;
• Legal or Regulatory requirements;
• Reliability;
• Performance.

If you are willing to learn about the functional and non-functional requirements, all crucial differences with examples, feel free to check our recent blog post.

https://jelvix.com/blog/functional-vs-nonfunctional-requirements