![]() ![]() ![]() Often apply to the system as a whole rather than individual features or services. Non-functional requirements Constraints on the services or functions offered by the system such as timing constraints, constraints on the development process, standards, etc. Three classes of requirements: 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. It may be part of the contract between the system buyer and the software developers. The system requirements document (sometimes called a functional specification) should define exactly what is to be implemented. System requirements Detailed description of what the system should do including the software system's functions, services, and operational constraints. Two kinds of requirements based on the intended purpose and target audience: User requirements High-level abstract requirements written as statements, in a natural language plus diagrams, of what services the system is expected to provide to system users and the constraints under which it must operate. As much as possible, requirements should describe what the system should do, but not how it should do it. Requirements may range from a high-level abstract statement of a service or of a system constraint to a detailed mathematical functional specification. The requirements themselves are the descriptions of the system services and constraints that are generated during the requirements engineering process. Requirements engineering (RE) is the process of establishing the services that the customer requires from a system and the constraints under which it operates and is developed. ![]()
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