The drafter prepares detailed plans and specification drawings from the ideas, notes, or rough sketches of scientists, engineers, architects, and designers. Sometimes drawings are developed after a visit to a project in the field or as the result of a discussion with one or more people involved in the job. The drawings, which usually provide a number of different views of the object, must be exact and accurate. Such drawings usually include information concerning the quality of materials to be used, their cost, and the processes to be followed in carrying out the job. In developing drawings made to scale of the object to be built, most drafters use computer-aided design (CAD) systems, and are often known as CAD operators. Technicians work at specially designed and equipped interactive computer graphics workstations. They call up computer files that contain data about a new product; they then run the programs to convert that information into diagrams and drawings of the product. These are displayed on a video screen, which then acts as an electronic drawing board. Following the directions of an engineer or designer, the drafter enters changes to the product's design into the computer. The drafter merges these changes into the data file, then displays the corrected diagrams and drawings.

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