Functional and Non-Functional
Requirements
A requirement is a statement of what the
system must do or what characteristics it
needs to have.
•Requirements describe
- what the business needs
(business requirements)
-what the users need to do
(user requirements)
- what the software should do
(functional requirements)
- characteristics the system should have
(non-functional requirements), and
-how the system should be built
(system requirements)
