Tuesday, September 20, 2011

Difference between Functional Requirement and Non- Functional Requirement

The Functional Requirement specifies how the system or application SHOULD DO where in. Non- Functional Requirement it specifies how the system or application SHOULD BE.

Some Functional Requirements are,

Authentication
Business Rules
Historical Data
Legal and Regulatory Requirements
External Interfaces

Some Non-Functional Requirements are,

Performance
Reliability
Security
Recovery
Data Integrity
Usability

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