EMC-CS-2010JLR is a component specification of Jaguar Land Rover, and the designator itself is informative: the letters identify the document as an electromagnetic compatibility component specification, the year indicates the generation of the requirement, and the trailing version number shows that the specification is revised within a generation rather than reissued under a new year. That last point is the one a supplier should note. Specifications of this kind are maintained as living documents, and a component tested against version 1.0 may not satisfy version 1.2 if a level has been raised or a port added in the interval, so the version must be recorded in the test plan and confirmed at the point of testing rather than at the point of quotation. The specification is paired with the manufacturer's test methods.