Non- functional requirements are those which are not 
related to functionality of the applciation but related to 
UI requirements, Performance of the system, Project 
management, OS,Hardware etc.,

Hi arif thank u for responding for my question, but please 
give some examples for non-functonal requirements.(give 
some name).
thank you
sai4sm

management people only define non functional requiremnts 
relating to 
  . Standards to be maintained.
  . Cost.
  . Time.
  . UI Interface, OS,Hardware , Additional features.

Non-Functional Testing

Testing the application based on the clients and 
performance requirement. Non-functioning testing is done 
based on the requirements and test scenarios defined by the 
client. Non-functional testing covers

Load and Performance Testing 
Ergonomics Testing 
Stress & Volume Testing 
Compatibility & Migration Testing 
Data Conversion Testing 
Security / Penetration Testing 
Operational Readiness Testing 
Installation Testing 
Security Testing (Application Security, Network Security, 
System Security) 
Web Spiders Testing Practice has 175+ person-years of 
experience across various types of Non-Functional testing.