Types of requirement

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User requirements
Statements in natural language plus diagrams of the services the system provides and its operational constraints. Written for customers.

System requirements
A structured document setting out detailed descriptions of the system’s functions, services and operational constraints. Defines what should be implemented so may be part of a contract between client and contractor.

Functional requirements
Statements of services the system should provide, how the system should react to particular inputs and how the system should behave in particular situations.

May state what the system should not do.

Non-functional requirements
Constraints on the services or functions offered by the system such as timing constraints, constraints on the development process, standards, etc.

Often apply to the system as a whole rather than individual features or services.

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