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Functional vs. Non-functional requirements

By Kate Swindlehurst - Mar. 13, 2023

The difference between functional and non-functional requirements is important for solution requirements when developing a new product or system. Both deal with the requirements of producing a new product or system but focus on different aspects of the finished product.

Functional requirements describe what a product or system does, which includes its features and functions. Non-functional requirements describe the general properties of the product or system, such as how it works and other quality attributes.

Key Takeaways:

Functional RequirementsNon-functional Requirements
Functional Requirements explain how a product or system must work.Non-functional requirements explain how the system should perform.
They define product features while focusing on user requirements. These are mandatory.They define product properties while focusing on the expectations of a user. They are not mandatory but recommended.
It is captured in the use case.It is captured as a quality attribute.

Functional vs. Non-functional requirements

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