As a Canadian government publication it is concurrently published in French as Classification nationale des professions.
[1] The NOC a joint project between Employment and Social Development Canada (ESDC) and Statistics Canada and classifies over 30,000 occupational titles into 500 Unit Groups, organized according to 4 skill levels and 10 skill types.
[2] The NOC is used by students, workers, employers, career and vocational counsellors, educational and training organizations.
The 2011 revision combined the variation National Occupational Classification for Statistics (NOC-S) and the 2006 NOC version into one system with structural changes.
The NOC supersedes the Canadian Classification Dictionary of Occupations (CCDO), which was published by the then Human Resources and Skills Development Canada (HRSDC) (now ESDC) in 1981.