Background The Para athletics wheelchair-racing classification system employs best practice to ensure that classes comprise athletes whose impairments cause a comparable degree of activity limitation.

The North American Industry Classification System (NAICS) is an industry coding system designed to facilitate the collection, analysis, and presentation of economic data in the United States, Canada, ...

Muscle injury classification systems for hamstring injuries have evolved to use anatomy and imaging information to aid management and prognosis. However, classification systems lack reliability and ...