A requirement is simply a statement of what the system must do or what characteristics it needs to have. Requirements evolve from broad statements of overall （ 1） from the system to detailed statements of the business capabilities that a system should support to detailed technical
statements of the way in which the capabilities will be implemented in the new system. （2） focus on describing how to create the software product that will be produced from the project
Nonfunctional requirements are primarily used in the design phase when decisions are made about the user interface, the hardware and software, and the system's underlying architecture. The
system's physical and technical environments would be considered （3）. The speed, capacity, and reliability of the system belong to （4）. （5） describes that who has authorized access to the system under what circumstances.
（1）A.business needs
B.operation processes
C.technical specification
D.function components

（2）A.User requirements
B.Business requirements
C.Function requirements
D.System requirements

（3）A.a functional requirement
B.a technical requirement
C.an operational requirement
D.a service requirenient

（4）A.security requirement
B.performance requirement
C.technical requirement
D.information requirement

（5）A.System constraint
B.Cultural requirement
C.Control requirement
D.Security requirement