Types of Non-Functional Requirements
- Performance Requirements:
- Response Time: Specifies the maximum time the system should take to respond to user requests.
- Throughput: Defines the number of transactions or operations the system should handle within a specific timeframe.
- Scalability: Specifies the system’s ability to handle increased load by adding resources without significant performance degradation.
- Concurrency: Specifies the number of users or processes the system can support simultaneously.
- Reliability and Availability Requirements:
- Reliability: Specifies the system’s ability to perform its functions consistently and predictably over time without failure.
- Availability: Defines the percentage of time the system should be operational and accessible to users.
- Fault Tolerance: Specifies the system’s ability to continue operating in the event of hardware or software failures.
- Security Requirements:
- Authentication: Specifies how users are verified and authenticated when accessing the system.
- Authorization: Defines the access rights and permissions granted to users based on their roles and privileges.
- Auditing and Logging: Specifies the system’s ability to track and record user activities, changes, and security events for auditing and compliance purposes.
- Usability Requirements:
- Ease of Use: Specifies the system’s intuitiveness, simplicity, and user-friendliness.
- Accessibility: Defines the system’s ability to be used by people with disabilities and conform to accessibility standards.
- User Interface Design: Specifies the visual layout, navigation, and interaction design of the system’s user interface.
- Compatibility Requirements:
- Interoperability: Specifies the system’s ability to communicate and exchange data with other systems or components.
- Platform Compatibility: Defines the platforms, operating systems, browsers, or devices the system should be compatible with.
What are Non-Functional Requirements in System Design? | Examples, Definition
The Non-functional requirements (NFRs) are the criteria that describe aspects of a system’s operation that are not directly related to its specific behaviors or features. Unlike functional requirements, which specify what the system should do, non-functional requirements define how the system should perform, its quality attributes, constraints, and other characteristics that affect its overall operation and usability. Non-functional requirements are essential for ensuring that the system meets performance, security, usability, and other quality standards.