Functional and Non-functional requirements are those statements that specify what the system should do.

Functional Requirements describe the behavior of the system; while on-functional requirements state a characteristic of the performance. For example: The functional requirement of a table is to hold objects, while the non-functional requirement is to hold up to 50kg.

Some examples of Functional and Non-Functional requirements:

Functional Requirements

• 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-Fuctinal Requirements

• Performance
• Scalability
• Capacity
• Availability
• Reliability
• Recoverability
• Maintainability
• Serviceability
• Security
• Regulatory
• Manageability
• Environmental
• Data Integrity
• Usability
• Interoperability

 

References:

StackOverflow. (2015). what is functional and non functional requirement. August 8th, 2016, from StackOverflow. Website: http://stackoverflow.com/questions/16475979/what-is-functional-and-non-functional-requirement

Ulf, E. (2012). Functional vs Non Functional Requirements. August 8th, 2016, from ReQtest. Website: http://reqtest.com/requirements-blog/functional-vs-non-functional-requirements/