MBN 10284-2 is a standard of the German manufacturer whose component requirements carry the MBN prefix, and the part numbering indicates that the subject is treated in several documents, of which this is the second. In the practice of this manufacturer the components of a vehicle are grouped by system, and the electromagnetic requirement is written so that the applicable part can be selected from the position and function of the component rather than applied uniformly, which is why the standard is divided in this way. A supplier receives the part number in the engineering specification that accompanies the request for quotation, and the test programme is drawn up against that part together with the manufacturer's test method documents. The laboratory at which the tests are performed must be accepted by the manufacturer, and the report follows a prescribed format.