The job classifications in the tables are taken from the U.S. Department of Labor's Dictionary of Occupational Titles, and are comparable to those classifications as found in the National Occupational Classification Career Handbook (NOC-CH).

SEDENTARY WORK - Exerting up to 10 pounds of force occasionally and/or a negligible amount of force frequently or constantly to lift, carry, push, pull or otherwise move objects, including the human body. Sedentary work involves sitting most of the time, but may involve walking or standing for brief periods of time. Jobs are sedentary if walking and standing are required only occasionally and all other sedentary criteria are met.

LIGHT WORK - Exerting up to 20 pounds of force occasionally and/or up to 10 pounds of force frequently, and/or negligible amount of force constantly to move objects. Physical demand requirements are in excess of those for sedentary work. Light work usually requires walking or standing to a significant degree. However, if the use of the arm and/or leg controls require exertion of forces greater than that for sedentary work, and the worker sits most of the time, the job is rated light work.

MEDIUM WORK - Exerting up to 50 pounds of force occasionally, and/or up to 20 pounds of force frequently, and/or up to 10 pounds of force constantly to move objects.

HEAVY WORK - Exerting up to 100 pounds of force occasionally, and/or up to 50 pounds of force frequently, and/or up to 20 pounds of force constantly to move objects.

VERY HEAVY WORK - Exerting in excess of 100 pounds of force occasionally, and/or in excess of 50 pounds of force frequently, and/or in excess of 20 pounds of force constantly to move objects.