IEC 60191-1:2007 gives guidelines on the preparation of outline drawings of discrete devices. For preparation of outline drawings of surface mounted discrete devices, IEC 60191-6 should be referred to as well. The main changes from the previous edition are as follows: - requirement added for SI-dimensions for new drawings to be published; - former rules concerning inch-dimensions are given in an informative annex; - former rules for coding are given in an informative annex; incorporation of the supplements; - updating of references and - restructuring and renumbering.