This International Standard specifies a key for the layout of documents relating to administrative, commercial, productive and distributive activities constituting trade, irrespective whether these documents are completed in handwriting, by mechanical or automatic equipment or by reproduction. It is intended particularly for the designing of aligned series of forms employing a reproducible master in a one-run method of document preparation. Documents prepared in this way are regarded as originals and copies in the same manner as documents prepared by other methods.