Requires the ability to apply principles of logical or scientific thinking to define problems, collect data, establish facts, and draw conclusions; to interpret an extensive variety of technical instructions in mathematical or diagrammatic form; and to deal with several abstract and concrete variables. Work in this classification is considered light physical work and requires the exertion of up to 20 pounds of force occasionally to lift objects and a negligible amount of force frequently to lift, carry, push, pull, or otherwise move objects.