Tests and measures are often broken up into two categories:
Non-commercial ("unpublished"): usually instruments that are found in books, journal articles, dissertations, etc. While most do not require purchase, they may still be protected by copyright law. Researchers should seek permission for use unless permission has been explicitly granted.
Commercial ("published"): instruments that are usually licensed for use by a specific publisher and require purchase. Beware of unauthorized versions on the Internet.
Be sure to check with the university's Institutional Review Board to make sure all required procedures and policies are followed when using tests in your research.
PsycTESTS is a research database that provides access to mainly non-commercial or "unpublished" psychological tests, measures, scales and other assessments found in articles, books, dissertations, etc. Includes descriptive and administrative information.
Other sources of non-commercial tests: PsycTests contains only a small percentage of the world's unpublished tests. Check other sources mentioned in this research guide: