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On proposed construction projects, such as highways, airstrips, and housing developments, it is the surveyor's responsibility to make necessary measurements through an accurate and detailed survey of the area. The surveyor usually works with a field party consisting of several people. Instrument assistants, called surveying and mapping technicians, handle a variety of surveying instruments including the theodolite, transit, level, surveyor's chain, rod, and other electronic equipment. (See "Surveying and Mapping Technicians.") In the course of the survey, it is important that all readings be recorded accurately and field notes maintained so that the survey can be checked for accuracy.