13.1 Overview
As stated in the SysML specification [1], a requirement specifies a capability or condition that must (or should) be satisfied, a function that a system must perform, or a performance condition a system must achieve.
Requirements come from many sources. Sometimes requirements are provided directly by the person or organization paying for the system, such as a customer who hires a contractor to build his or her house. At other times, requirements are generated by the organization that is developing the system, such as an automobile manufacturer that must determine the consumer preferences for its product. The source of requirements often reflects multiple stakeholders. In the case of the automobile manufacturer, the requirements ...
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