a necessary task, action, or activity that must be accomplished by a system
A description of what a system should be able to do–a function it should perform. Government Off-The Shelf Software Government (Federal, State, Local, etc) developed software. Health Insurance Portability and Accountability Act (HIPAA) The Administrative Simplification provisions of the Health Insurance Portability and Accountability Act of 1996 are intended to reduce the costs and administrative burdens of health care by making possible the standardized, electronic transmission of health care data.
A statement that specifies WHAT a system must do. The statement should use formal “shall” language and specify a function in terms that the stakeholders, particularly the system implementers, will understand. In the National ITS Architecture, Functional Requirements have been defined for each Equipment Package that focus on the high-level requirements that support regional integration.
A functional requirement specifies what the system must be able to do, it terms that are meaningful to its users.
A requirement that specifies a function (activity or behavior, based on a business requirement) that the system (or system component) must be capable of performing.
A statement of WHAT the system is required to do.