MBN 10284-4 is a further part of the same family of component requirements of the German manufacturer as the part listed separately on this site, and the two should be read as a set: the family is organised by the class of component and its position in the vehicle, so a programme selects the part that governs the equipment being developed and cites it in the specification. A supplier encountering the family for the first time should establish which parts exist and which apply, since a component that is moved during development, for example from the body to the powertrain domain, may fall under a different part with different levels. Because the parts are revised independently, the edition of the applicable part should be recorded in the test plan in the form in which the specification quotes it.