Strong Interest Inventory (SII)
Psychology: Cognition & EducationReliability: alphas 0.80–0.92 across themes3 sample items
About this scale
A 291-item measure of vocational interests built around Holland's RIASEC model (Realistic, Investigative, Artistic, Social, Enterprising, Conventional) and 30 basic interest scales. Standard career-counselling instrument.
Sample item(s)
“Indicate your preference (Like / Indifferent / Dislike) for: Carpentry (Realistic)”
“Indicate your preference for: Statistics (Investigative)”
“Indicate your preference for: Sales clerk in retail store (Enterprising)”
Reliability
Reported internal consistency: alphas 0.80–0.92 across themes. As a rule of thumb, Cronbach’s α ≥ .70 is considered acceptable, ≥ .80 good, and ≥ .90 excellent for established measures.
Notes
Commercial license.
Source & citation
Donnay, D. A. C., Morris, M. L., Schaubhut, N. A., & Thompson, R. C. (2005): Strong Interest Inventory Manual: Research, Development, and Strategies for Interpretation. CPP.
Source. Scale details are summarised from the publication cited above. Always consult the original source for the full item set, scoring, and permission to use.
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