Hierarchy and structure

The National Occupational Classification (NOC) 2021 is based on a five-tiered hierarchical structure. The first level contains 10 broad occupational categories, the second level is made up of 45 major groups, the third level consists of 89 sub-major groups, the fourth level gathers 162 minor groups, and the last level comprises 516 unit groups.

The hierarchy and structure presented below allows you to drill down from one of the broad occupational categories to its associated unit groups and access the profile page of a unit group.

It is possible to select a previous version of the classification (NOC 2006, 2011, and 2016) to see its hierarchy and structure.

Structure breakdown – NOC 2021 Version 1.0

2 Natural and applied sciences and related occupations
21 Professional occupations in natural and applied sciences
212 Professional occupations in applied sciences (except engineering)
2121 Mathematicians, statisticians, actuaries and data scientists
21211Data scientists

Data scientists use advanced analytics technologies, including machine learning and predictive modelling, to support the identification of trends, scrape information from unstructured data sources and provide automated recommendations. They are employed by consulting firms, universities, banks and information technology departments in the private and public sectors.

View unit group profile
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