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Home » Health Professionals » Physical Injuries » Work Ability Definitions

Work Ability Definitions

 

The following information is from the Workplace Guidelines for Disability Duration, 3rd Edition (1997), Presley Read Mr Dassakis - Read Group Limited. Boulder, Colorado, USA).

 

There are five job classifications based on the amount of physical effort required described in the United States Department of Labor’s Dictionary of occupational titles. These include:

 

 

A Sedentary work

 

This includes exertion of up to 4.5 kg on an occasional basis but minimal amount of force on a regular basis to lift, carry, push or pull objects. This work involves sitting most of the time but may occasionally require walking or standing.

 

 

B Light work


This involves exertion of up to 9 kg of force occasionally but 4.5 kg on a more frequent basis. Physical demand requirements are in excess of those required for sedentary work. Light work requires moving about from sitting to standing to a significant degree.

 

 

C Medium work

 

This is defined as exertion of up to 22.5 kg of force occasionally and up to 9 kg on a more frequent basis.

 

 

D Heavy work

 

This is defined as exertion of up to 35 kg or force occasionally and greater than 22.5 kg of force on a frequent basis. Work that requires at least 9 kg of force constantly to move objects is in this category.

 

 

E Very heavy work

 

This is defined as occasional excesses of more than 45 kg of force, but excess of 22.5 kg or more on a frequent basis. Work that requires constant use of greater than 9 kg of force to move objects is also classified as very heavy work.

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