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1. Choose a database release and build the occupation lookup
Keep the occupation, skill, task, and related-occupation data from one O*NET release so codes and fields are interpreted consistently. The current O*NET Resource Center documentation surfaced here is for O*NET 31.0.
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Begin with the occupation data file and retain each record’s O*NET-SOC code, title, and description. Use the code—not the title—as the cross-file identifier: O*NET states that occupation-specific data are connected across its database via the O*NET-SOC code. Titles are useful labels, but they are not the documented join key. The O*NET 31.0 Occupation Data file contains 1,016 occupation rows; that count applies to that file, not necessarily to every O*NET data domain.
2. Join skills and tasks as separate domains
Skills
Join occupation-specific skill records to the lookup by O*NET-SOC code. Preserve the element name or identifier, the scale, and the rating fields. A rating without its scale is not a meaningful stand-alone skill label. O*NET 31.0’s separate Knowledge file illustrates why coverage and quality fields matter: it contains 60,060 row objects and ratings for 910 occupations. Those counts describe the Knowledge domain only, not all O*NET data.
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Do not merge all skill-like information into one undifferentiated list. O*NET publishes transferable-skills data and software-skills data as distinct domains. The O*NET 31.0 Software Skills file has 31,821 rows, including software workplace examples and hot-technology or in-demand flags. Label these as software skills rather than treating them as interchangeable with occupation-specific skill ratings.
Tasks
Join task statements and task ratings to the same occupation code, separately from skills. Keep the task text and any rating or category fields supplied by the selected release. Skills describe capabilities associated with work; tasks describe work performed. Comparing both helps distinguish what an occupation involves from the abilities associated with it.
Before implementing a data pipeline, check the selected release’s individual skill and task file documentation for the exact column names and rating scales. The field names and scales should not be inferred from another release or from the occupation file.
3. Interpret ratings with their context
Retain the scale name and source fields alongside every rating, as well as the date and any available sample size, standard error, confidence bounds, suppression status, or not-relevant indicator. The O*NET Knowledge file documents these kinds of fields; where a field is present, dropping it can make a downstream comparison look more certain or complete than the underlying data supports.
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For a comparison between occupations, show work performed, capabilities, and knowledge separately. Use task statements and task ratings for work; skill and transferable-skill elements for capabilities; and knowledge ratings with their available uncertainty and coverage information. Avoid combining these into a single “fit” score unless you have a defensible method and explain it.
4. Use related occupations as career-exploration leads
O*NET related-occupation data can suggest occupations to investigate. Its approach considers what workers do, what they know, and what the occupations are called. That makes related occupations useful starting points for someone seeking work that matches existing skills, education, and experience—not evidence of a guaranteed transition or minimal retraining.
For each candidate, check its tasks, skills, knowledge, education and training, job zone, and other relevant occupation data before drawing conclusions about preparation. Similarity in O*NET does not establish local job openings, pay, hiring outcomes, qualifications, or how easy the transition will be.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Link O*NET to other occupation systems with crosswalks
When a project needs to connect O*NET records to another classification, use an official crosswalk where available. O*NET lists crosswalks for CIP, DOT, RAPIDS, the Occupational Outlook Handbook, SOC, and ESCO in its crosswalk resources.
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6. Keep the mapping auditable
- Store the O*NET-SOC code with each occupation, skill, task, and related-occupation record.
- Record the database release and, for external mappings, both classification versions and the crosswalk update date.
- Keep skills, transferable skills, software skills, tasks, and knowledge labeled as distinct domains.
- Preserve rating scales and all available quality or coverage fields rather than retaining a bare number.
- For a career candidate, record whether it came from related-occupation data or an external crosswalk; these sources answer different questions.
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