This part of ISO 128 establishes the types of lines, their designations and their configurations, as well as general rules for draughting of lines used in technical drawings, e.g. diagrams, plans or maps. In addition, this standard specifies general rules on the representation of leader and reference lines and their components as well as on the arrangement of instructions on or at leader lines in technical documents. Annexes have been provided for specific information on mechanical, construction and ship building technical drawings. For the purpose of this International Standard the term “technical drawing” shall be interpreted in the broadest possible sense encompassing the total package of documentation specifying the product (workpiece, subassembly, assembly).