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For a career app, O*NET, ESCO, and the U.S. Bureau of Labor Statistics’ Occupational Outlook Handbook (OOH) are complementary sources, not interchangeable occupation lists. O*NET supplies detailed U.S. worker attributes and job characteristics; ESCO provides a multilingual European classification of occupations, skills, and competences; and the OOH offers U.S. career descriptions and employment outlook context. Choose by the people and geography your app serves, then preserve each source’s identifiers, dates, and reuse terms.
What each source is best for
| Source | Best fit | Data and access | Geography and version context |
|---|---|---|---|
| O*NET | Detailed occupational information for a U.S.-focused career app | Worker attributes and job characteristics; downloadable data files and web services | U.S. occupational resource. The O*NET Resource Center describes 900 occupation profiles and more than 55,000 jobs; those are figures on its undated page, accessed 2026-10-04, not an independently verified current export. O*NET Data Collection Overview |
| ESCO | Multilingual occupational and skills classification for European users and cross-border use cases | Occupations, skills, competences, and their relationships; SKOS-RDF, ODS and CSV downloads, web service, and local APIs | Datasets are available in 28 languages and concepts have persistent URI identifiers. The European Commission page accessed for this article labels the classification v1.2.1, last updated 2025-10-12, and release v5.7.0; verify current details before importing. Use ESCO |
| BLS Occupational Outlook Handbook | U.S. career descriptions and occupational outlook context | Whole-handbook XML download; BLS also directs users to Employment Projections for detailed projections and Occupational Employment and Wage Statistics for national and subnational employment and wage data | OOH follows the Standard Occupational Classification system; industry information follows NAICS. OOH Data Access and Republishing Information |
O*NET: occupational detail
O*NET describes its database as information about worker attributes and job characteristics. Its collection draws on experts, analysts, employer postings, workers, government sources, machine-learning and natural-language-processing methods, web research, and other inputs. The Resource Center says portions of every occupation profile are refreshed annually, while some details—including job titles and software skills—are updated more often. Check the source’s current release and field dates rather than treating the entire database as updated on one schedule. O*NET Data Collection Overview
O*NET OnLine can display material from outside organizations. A record visible in that interface is not automatically O*NET-owned or covered by the same license; the external-source disclosures identify source and date information. O*NET OnLine: External Data Sources
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ESCO: occupations linked to skills across languages
ESCO is intended to standardize occupations and skills across European countries and support labor mobility, matching and search, career guidance, learning management, and labor-market research. Persistent URIs give concepts identifiers that can be retained in an app even when labels are localized. Its formats and API options support different integration approaches, but the release and language coverage should be recorded with imported data. Use ESCO
#1 Best Overall
OOH: career narratives and outlook context
The OOH is a BLS career-information product, not the same thing as a detailed occupational projection dataset. BLS provides a downloadable XML file for the handbook and points developers to separate Employment Projections and Occupational Employment and Wage Statistics resources for more detailed outlook or wage and employment data. In the OOH, occupational classifications follow SOC, while industry information follows NAICS. OOH Data Access and Republishing Information
Choose sources by app geography and purpose
- U.S.-focused app: Use O*NET when users need detailed worker attributes or job characteristics. Add OOH descriptions or outlook context where useful, keeping the source and period visible.
- European or multilingual app: Use ESCO for its occupations, skills, competences, language coverage, and persistent identifiers.
- Global app: Support the relevant systems side by side. Store geography and source provenance with each field; do not flatten local classifications, dates, or labor-market measures into supposedly universal facts.
- App requiring projections or pay data: Use the BLS resources intended for those values rather than assuming the handbook alone is a complete employment or wage dataset.
Compare candidate data on five practical axes: the users’ geography, the content needed, the available access method, the date and update cadence for each imported value, and whether any cross-source mappings preserve uncertainty.
Integrate records without losing their meaning
- Pick a primary classification for each market. Decide whether the app’s user experience is organized around O*NET, ESCO, or another locally appropriate system. Do not make a crosswalk the hidden foundation of the product’s occupation model.
- Use the documented access route. O*NET offers downloadable files and web services; ESCO offers downloadable SKOS-RDF, ODS, and CSV data plus web-service and local APIs; BLS offers the OOH XML file. Check each source’s current documentation and release when implementing.
- Store provenance with imported values. Retain the source name, original code or URI, source release or update date, geography, and the date your app imported the value. Field-level provenance is especially important when a screen combines descriptions, skills, and outlook from different sources.
- Keep crosswalks explicit. When you connect records, retain both original identifiers, the crosswalk’s source and date, and any multiple candidates or confidence information available to your process. Present the relationship as a mapping, not as proof that the occupations are identical.
- Refresh according to the source. O*NET says some profile content is refreshed annually and some details more frequently. ESCO publishes versioned classification data. For BLS outlook, store the projection period with the values rather than displaying a period-free “growth” label.
Can O*NET and ESCO occupations be mapped?
Yes. The O*NET Resource Center provides crosswalk files, including an ESCO mapping to the O*NET-SOC taxonomy. It says that mapping was produced using AI techniques with human validation. The same crosswalk page says the OOH crosswalk is developed and maintained by BLS and lists its file as updated September 2025. O*NET Crosswalk Files
A crosswalk connects classifications; it does not make their concepts identical. The ESCO crosswalk documentation does not establish a perfect or one-to-one match. Keep each source code on the mapped record and show ambiguity or multiple matches where relevant, rather than silently replacing one system’s identity with another.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Handle employment outlook as a dated estimate
The BLS National Employment Matrix underlies occupational employment information in the OOH. BLS identifies OEWS, Current Employment Statistics, and Current Population Survey data among its primary inputs, and describes projections as a chain of linked models and assumptions. Individual occupational projections are subject to error because future economic conditions include unknown factors. Employment Projections Data Overview
The BLS Employment Projections overview was last modified 2026-08-27. Separately, O*NET OnLine’s external-source table lists OOH-linked BLS projection material as 2024–2034 and dated 2025-09-16; that is the period and date shown by that table, not a shared vintage for every OOH fact. Display the relevant geography, projection period, source, and date alongside outlook figures. BLS cautions: “Furthermore, while occupational employment projections and related job outlook information can provide valuable inputs to the career decision-making process, they should not be the sole basis for a choice of career.” Employment Projections Data Overview
Quick Recap
Rank #4
Check reuse terms and attribution for each asset
- BLS text and data: BLS says its public-domain material may be reused without specific permission and asks users to cite BLS. OOH photographs are protected and require permission from the copyright holder. OOH Data Access and Republishing Information
- O*NET and displayed third-party material: Do not assume every item surfaced in O*NET OnLine is covered by the O*NET content license; check the relevant source disclosure and terms. O*NET OnLine: External Data Sources
- ESCO, APIs, and crosswalks: Review the terms attached to the specific dataset, API, and mapping file you use. A reuse statement for one asset is not a blanket license for everything displayed alongside it.
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