Requires the ability to apply principles of logical thinking to define problems, collect data, establish facts and draw valid conclusions; to interpret an extensive variety of instructions in written, oral, mathematical, schedule or diagrammatic form, to deal with several abstract and concrete variables. Tasks involve the ability to exert very moderate physical effort in light work, typically involving some combination of remaining standing for extended periods of time, writing on a chalkboard, stooping, kneeling and crouching, and some lifting, carrying, pushing and/or pulling of objects and materials of moderate weight (12 to 20 pounds).