Functional and Non-functional Requirements



There are two types of requirements viz. Functional and Non-functional requirements.


Functional Requirements
These form the behavior of the product. Some examples of functional requirements are,
  • New features
  • Bug fixes
  • New behavior


Non-functional Requirements
These are implicit expectations from the product. Since these are expected features and not specifically documented requirements, they are also known as 'Quality Attributes'. Some examples of non-functional requirements are,
  • Performance
  • Reliability
  • Error handling
  • Ease of use
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