A personality test is a questionnaire or other standardized instrument designed to reveal aspects of an individual's character or psychological makeup. The first. This free personality test is based on Carl Jung's and Isabel Briggs Myers' typological approach to personality. Obtain your 4-letter type formula according to Carl Jung’s and Isabel Briggs Myers’ typology, along with the strengths of preferences and the description of your. Everybody is curious about their personality, so psychology to the rescue! Our personality test is similar to the Myers Briggs (MBTI) and the Jung personality tests.