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Other Online Sources Related to Scales & Measurement
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The site provides free "tests" that measure a variety of things including IQ, personality, career aptitude, and work values. Although the tests and measures can be used by professionals for testing others, it appears the site is primarily for individuals who want to assess themselves.
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These are the folks who have published the Buros Mental Measurements Yearbook and Tests in Print for decades. They mainly provide reviews of measures. You can perform searches for reviews at the site and then either pay to download them or use the references to check out the material of interest at a library that owns the series.
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The Center for Research on Environmental Decisions at Columbia University provides a Decision Making Individual Differences Inventory (DMIDI). The inventory has over 170 individual difference measures commonly used in judgment and decision-making research.
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This clearinghouse on assessment and evaluation seeks to provide information concerning educational assessment as well as resources to encourage responsible test use. There are links at this site to hundreds of other related sites.
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The ETS (Educational Testing Service) test collection contains more than 20,000 tests and other measurement devices. Some of these tests are available for immediate purchase and may be downloaded using Adobe Acrobat.
This is not a book per se but rather a "wikibook," a set of scales used in the “management” literature that have been described by some contributor. The number of scales and information provided about them is extremely limited.
International Personality Item Pool
This site is intended to provide easy access to measures of individual differences, all in the public domain, to be developed conjointly among scientists worldwide, and raw data available for reanalysis; in addition, it should serve as a forum for the dissemination of psychometric ideas and research findings.
Measurement Instruments for the Social Sciences
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This open-access journal has a focus on the development and improvement of measurement instruments for use across social science disciplines.
The Questionnaire Instrument Compendium (QIC) is maintained by Alan Reifman at Texas Tech University and has links to several dozen sites with measures primarily related to social-psychological constructs. The scales themselves do not seem to be at the site itself but links are supposed to be available for reaching them..
The site claims to have "the largest online battery of professionally developed and validated psychological assessments." While we can not independently verify that, it is clear that the site provides dozens if not hundreds of tests for free.
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Personality tests and measures of cognitive ability are provided at this site primarily for use by employers when assessing a potential employee in order to predict job performance.
The discussion forum at this site was created as a place to learn and share information about personality type. The core objective of the forum is to establish a communal atmosphere helping people to learn more about themselves, personality type and psychology; as well as understanding different points of view and manners of expression.
The folks at Wikijob provide some free aptitude tests, skills tests, and personality tests that are designed to help people in their career journeys. See also TestHQ, a related site by the same company.