Similarly worded descriptions of jobs' physical requirements are also used as part of the analysis for determining eligibility for Social Security disability payments. If you want some reading that's far less interesting than tube-chassis race cars, just look up Title 20 of the Code of Federal Regulations and read all about it. I spent 2 years as a law clerk for a federal judge, and part of the job was drafting opinions on Social Security appeals. Many of the decisions would turn on whether, given their limitations, the Social Security applicants could perform "sedentary," "light" or "medium" work activities.