Learning what the most common errors are in creating or reading engineering drawings - and then learning how to avoid them altogether - has untold benefits for all engineers, technicians and draftsmen, be they mechanical engineers, product designers, manufacturing engineers, structural engineers, machinists, or others involved the technical graphic information for component, machines and systems. Based on a reference worked developed for engineers and technicians at Lockheed Martin, readers will find invaluable tips on how to: understand the data on a drawing; avoid dimension and tolerance errors; and, select the proper drawing type for a given engineering objective.