A Requirement specifies a System (Element)’s desired characteristic, quality, function aspect or behavior in defined circumstances under specific conditions.
The purpose of Requirements Engineering is
- To establish a complete set of stakeholder needs and
- ensure the correct and complete transition from stakeholder needs via product design to the implementation level, without loss of information (content and intent), during the product or service decomposition steps in the development process.
An integrated set of elements, subsystems, or assemblies that accomplish a defined objective. These elements include products (hardware, software, firmware), processes, people, information, techniques, facilities, services and other support elements. ⌊INCOSE 2015⌋
A combination of interacting elements organized to achieve one or more stated purposes.
link to System definition
A System whose life cycle is under consideration.