There are various types of requirements:
Business Requirement
Business
requirements represent a kind of "why"
information. It represent the
high level of objectives of the organization or customer who requests the
system. Business requirement why the organization is implementing the system. Vision and Scope statement record
the business requirement.
User Requirement
Requirements constitute one type of "what" information.
User requirements describe what the user will be able to do with the product,
such as goals or tasks that users must be able to perform. Use cases,
scenarios, user stories, and event response tables are some ways to represent
user requirements.
Functional Requirement
Functional requirement specify the software functionality that the developer
must build into the product to enable the user to accomplish their business
requirement . Functional requirements represent one kind of "what"
information. The traditional "shall" statements that
describe what the system "shall do" or what the system "shall
let the user do."
System Requirement
Describe
the top level requirement for a product that contain multiple subsystem that is
a system. A system can be all software or it can be both software and hardware.
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