The Strong Interest Inventory (SII) is an interest inventory used in career assessment. It is also frequently used for educational guidance as one of the most popular career assessment tools. The test was developed in 1927 by psychologist E.K. Strong, Jr. to help people exiting the military find suitable jobs. It was revised later by Jo-Ida Hansen, and David Campbell. The modern version is based on the typology (Holland Codes) of psychologist John L. Holland. The newly revised inventory consists of 291 items, each of which asks you to indicate your preference from five responses. It is an assessment of interests, and not to be confused with personality assessments or aptitude tests.
The test can typically be taken in 25 minutes after which the results must be scored by computer. It is then possible to show how certain interests compare with the interests of people successfully employed in specific occupations. Access to the comparison database and interpretation of the results usually incurs a fee.
Strong Interest Inventory is a registered trademark of CPP, Inc. of Mountain View, California.
The results include:
- Scores on the level of interest on each of the six Holland Codes or General Occupational Themes.
- Scores on 30 Basic Interest Scales (e.g. art, science, and public speaking)
- Scores on 244 Occupational Scales which indicate the similarity between the respondent's interests and those of people working in each of the 122 occupations.
- Scores on 5 Personal Style Scales (learning, working, leadership, risk-taking and team orientation).
- Scores on 3 Administrative Scales used to identify test errors or unusual profiles.
- Career development
- Personality Psychology
- Holland Codes
- Myers-Briggs Type Indicator
- Kingdomality Personal Preference Profile
- CPP, Inc. Exclusive publisher and copyright owner Web page.
- University of Kansas, Career Assessments & Tests. Counselling and Psychological Services web page.
- Effects of Strong Interest Inventory Feedback on Career Beliefs. Day, Michael Andrew; Luzzo, Darrell Anthony. Research report, 1997.