Here’s a comparison between functional and non-functional requirements in software development:
| Aspect | Functional Requirements | Non-Functional Requirements |
|---|---|---|
| Definition | What the system should do. | How the system should behave. |
| Focus | Specific tasks, functions, and features of the software. | Quality and performance of the system. |
| Examples |
– Login functionality: Users can log in with a username and password. – Search feature: Users can search for products in an online store. – Payment processing: The system processes credit card payments. |
– Performance: The system should load a page within 2 seconds. – Security: Data must be encrypted during transmission. – Usability: The software should be easy to navigate for users. |
| Purpose | Ensures the software does what it’s supposed to do. | Ensures the software operates efficiently and meets user expectations. |
| Measurement | Often measured by testing the functionality directly (e.g., does the login work?). | Measured by observing system attributes (e.g., speed, security tests). |
| Impact | Directly impacts what users can do with the software. | Impacts the user experience, reliability, and performance. |
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