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Researchers can find details about existing psychological measures through several different resources. Tools created specifically for scientific research are typically detailed in published journal articles and are free to use with a proper citation. Additionally, researchers can consult extensive catalogs such as the American Psychological Association's PsycTESTS database or reference books like the Mental Measurements Yearbook to locate both open-access and proprietary measurement tools.

Locating Existing Measures

A proprietary measure is an existing psychological assessment where a publisher owns the legal rights to the tool, requiring researchers to purchase it prior to use. These instruments are particularly common in clinical psychology applications and include standard intelligence tests as well as major assessments like the Beck Depression Inventory and the Minnesota Multiphasic Personality Inventory (MMPI).

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