For the success of a project, it’s requirements need to be well thought out, balanced and clearly understood. This understanding involves the comprehension of the differences between functional and non-functional requirements.
Functional requirements specify a vehaviour or function of the system.
Some of the more typical functional requirements include:
- Business Rules
- Transaction corrections, adjustments and cancellations
- Administrative functions
- Authentication
- Authorization levels
- Audit Tracking
- External Interfaces
- Certification Requirements
- Reporting Requirements
- Historical Data
- Legal or Regulatory Requirements
Non-functional requirements describe how the system works and should behave.
Some typical non-functional requirements are:
- Performance – for example Response Time, Throughput, Utilization, Static Volumetric
- Scalability
- Capacity
- Availability
- Reliability
- Recoverability
- Maintainability
- Serviceability
- Security
- Regulatory
- Manageability
- Environmental
- Data Integrity
- Usability
- Interoperability
