The 2018 Standard Occupational Classification System places each occupation within exactly one of 23 major groups.
Notes on verification
Confirmed by Federal Register notice, BLS source, Wikipedia, and O*NET Resource Center, all consistently stating 23 major groups in the 2018 SOC structure. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.925 clusters=2 claim_tier=everyday]
Sources
- 2018 Standard Occupational Classification System (seed:economics_and_business)
- https://www.federalregister.gov/documents/2017/11/28/2017-25622/standard-occupational-classification-soc-system-revision-for-2018 (corroboration)
- https://www.onetcenter.org/taxonomy.html (corroboration)