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What is the difference between a job and an occupation?
The International Labour Organization (ILO), in its ISCO-08 occupational classification FAQ, defines a job as “a set of tasks and duties performed, or meant to be performed, by one person,” whether for an employer or in self-employment. An occupation describes the kind of work in a job: the ILO defines it as “a set of jobs whose main tasks and duties are characterized by a high degree of similarity.” Put simply, a job is a person’s particular work; an occupation groups similar kinds of work.
The U.S. Bureau of Labor Statistics (BLS) uses a related statistical explanation: an occupation is a generalized job or family of jobs found across industries and locations, such as economist or carpenter. It is not the same as one position at one establishment. That usage describes a statistical concept, not a universal legal or sociological definition. BLS: Occupation Definitions
Is every occupation a profession?
Not necessarily. “Profession” is used in everyday speech in overlapping ways: it may refer to an occupation, a trade, or a field of work. The ILO and BLS definitions above explain how their statistical systems classify occupations; they do not establish a universal test for what qualifies as a profession. The sources do not provide a single worldwide definition that settles whether every occupation is a profession.
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That distinction matters when interpreting lists. A statistical category such as an occupation is not, by itself, a statement about licensing, credentials, social status, or entry requirements. Those conditions, where relevant, depend on the particular work and jurisdiction.
How do occupational classification systems group work?
Classification systems organize work into categories so it can be described and compared for statistical or administrative purposes. Their criteria and level of detail differ; they are structured tools, not universal inventories of every profession.
International Labour Organization: ISCO-08
The ILO’s International Standard Classification of Occupations, ISCO-08, groups work by similarity in skill level and skill specialization. Its structure has four levels: 10 major groups, 43 sub-major groups, 130 minor groups, and 436 unit groups. The ILO publication describing this structure is dated 10 May 2012. These are counts of categories within ISCO-08, not a count of all professions worldwide. ILO: ISCO-08
United States: SOC and Census categories
The U.S. Standard Occupational Classification (SOC) groups jobs according to the work performed and the skills, education, training, or credentials required. A BLS factsheet describes the SOC as covering more than 800 occupations and around 6,500 associated job titles. It contrasts that system with the Dictionary of Occupational Titles (DOT), which classified more than 12,000 job titles; the DOT was last updated in 1991 and was replaced by O*NET, according to the BLS. These figures describe the systems and measures cited, not the number of professions in the United States. BLS: Standard Occupational Classification
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France: PCS 2020
France’s National Institute of Statistics and Economic Studies (INSEE) describes PCS 2020 as a four-level classification: 6 socio-professional groups, 29 socio-professional categories, 121 grouped occupations, and 311 occupations. Its criteria include current or former occupation, employee or self-employed status, employer type, and qualification. The page defining the classification was updated in 2022. Its counts belong to the French system, not an international tally. INSEE: PCS 2020 definition
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Why do different lists give different counts?
A number only makes sense alongside the system that produced it. Classifications can cover different jurisdictions, organize work for different purposes, and count categories at different levels of detail. A broad group may contain many narrower occupations; another system may count job titles rather than occupation groups. Systems also change as classifications are revised.
For a meaningful comparison, check:
- Geography: Is the system international or specific to a country?
- Purpose and criteria: What features of work does it group, and for what use?
- Level: Is the number a count of broad groups, detailed occupations, or job titles?
- Edition and date: Which version is being counted, and when was it published or updated?
For example, ISCO-08’s 10 major groups and 436 unit groups are two levels in one classification. They cannot be added to the U.S. Census Bureau’s 569 categories or France’s 311 occupations to produce a global total: the systems use different structures and scopes.
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Is there one definitive list of professions?
No single list in these sources covers every profession under one universally accepted definition. ISCO-08 provides an international framework for classifying occupations, while national systems such as the U.S. SOC and France’s PCS serve their own classification needs. Each is useful within its scope, but none is a definitive worldwide inventory of professions.
When you encounter a list, identify its country or coverage, classification name and edition, and the level being counted. That tells you what its number actually describes.
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