This is a resource for free personality tests and personality psychology. The tests include (MOTIV, R-Drive, Enneagram, Advanced Enneagram, Compatibility, Jung, Big 5, Word Association, and others. There is also Ask The Oracle which is a decision making tool. All the tests at SimilarMinds.com are developed based on scientific measures used to ensure test validity. Statistical measures are used to ensure test questions measure what they are intended to measure. Some of the tests are experimental/beta versions but even those tests are made up of pre-tested and validated questions, they just won’t be as tuned/refined as a non beta test.