These systems also permit drafters to easily prepare many variations of a design. When CAD systems were first introduced, some thought a new occupation CAD operator would result. It is now apparent that a person who produces a technical drawing using CAD is still a drafter, and needs all the knowledge of traditional drafters as well as CAD skills. Because the cost of CAD systems is dropping rapidly, by the year 2005 it is likely that almost all drafters will use CAD systems regularly. Many drafters specialize.
Architectural drafters draw architectural and structural features of buildings and other structures.
They may specialize by the type of structure, such as schools or office buildings, or by material, such as reinforced concrete or stone. Aeronautical drafters prepare engineering drawings used for the manufacture of aircraft and missiles. Electrical drafters draw wiring and layout diagrams used by workers who erect, install, and repair electrical equipment and wiring in powerplants, electrical distribution systems, and buildings. Electronic drafters draw wiring diagrams, circuit board assembly diagrams, schematics, and layout drawings used in the manufacture, installation, and repair of electronic equipment. Civil drafters prepare drawings and topographical and relief maps used in civil engineering projects such as highways, bridges, pipelines, flood control projects, and water and sewage systems.