Holland code: the six RIASEC interest types, and how to use yours
The Holland code is the most widely used way to sort work interests. Psychologist John Holland proposed that people and work environments fall into six types, and that people do best where the two match. Here are the six types, how a three-letter code works and what the research says it can, and cannot, tell you.
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The six types
| Type | Drawn to | Example careers |
|---|---|---|
| Realistic (R) | Hands-on work with tools, machines, plants or animals | Electrician, wind turbine technician, veterinarian |
| Investigative (I) | Ideas, analysis and research | Data scientist, physicist, pharmacist |
| Artistic (A) | Creating, designing and expressing | Graphic designer, writer, architect |
| Social (S) | Helping, teaching and caring | Registered nurse, teacher, counselor |
| Enterprising (E) | Leading, persuading and selling | Sales manager, lawyer, founder |
| Conventional (C) | Order, detail and systems | Accountant, logistician, actuary |
How a three-letter code works
Your Holland code is your top three types in order, such as IAS or ESC. Holland arranged the six types on a hexagon: neighbors, like investigative and artistic, share more than opposites, like artistic and conventional. A code made of neighbors tends to be more consistent and easier to match.
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Take the free career test →What the research supports
Holland published the theory in 1959, and it became one of the most studied ideas in career psychology; a 2010 review traced how it evolved and where it holds up (Nauta, 2010). The most practical finding is about fit: across 60 studies with 15,301 participants, the match between people’s interests and their work predicted performance and persistence better than interest scores alone (Nye and colleagues, 2012).
What it cannot tell you
- Ability. Liking investigative work is not the same as being trained for it.
- Pay and hours. Two careers with the same code can differ widely.
- Values. Your code does not know whether you need security or autonomy more.
Interest clarity check
Rate each statement as it is for you now. 1 means not true; 5 means very true.
1 = not true · 5 = very true
A reflection prompt, not a psychological test or advice. Your answers stay in your browser; if you continue to the free chapter, only your total is added to the link.
Find your code, then go further
The free career test works out your interest pattern from your interests, hobbies and passions, then adds what the code leaves out: skills, competencies, values, hours and official pay, and names three career paths. The U.S. Department of Labor’s free O*NET® Interest Profiler is another well-built way to get your code.
Do it with others. A change is easier to hold when other people see your progress. In a meta-analysis of 138 studies, people who reported their progress publicly or recorded it reached their goals more often (Harkin and colleagues, 2016). Vcom is 12 months of self-directed accountability among professionals who work from the same model, so you are not redesigning your life alone.
Questions about the Holland code
How do I find my Holland code for free?
Take a free interest inventory such as the O*NET® Interest Profiler, or the free career test here, which also scores careers against your skills and values.
Can my Holland code change?
Interests are fairly stable in adulthood but not fixed. Retake an inventory after a major change.
Is the Holland code a personality test?
It measures work interests, not personality in general, although Holland described the types in personality terms.
Sources
- Holland, J. L. (1959). A theory of vocational choice. Journal of Counseling Psychology, 6(1), 35–45.
- Nauta, M. M. (2010). The development, evolution, and status of Holland’s theory of vocational personalities. Journal of Counseling Psychology, 57(1), 11–22. Source
- Nye, C. D., Su, R., Rounds, J., & Drasgow, F. (2012). Vocational interests and performance: a quantitative summary of over 60 years of research. Perspectives on Psychological Science, 7(4), 384–403. Summary by the Association for Psychological Science. Source
Checked October 16, 2026. Evidence labels follow the APSP evidence tiers. Educational content; not therapy or professional advice.
Keep exploring
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