The authors summarize over 30 years of research with the MBTI® assessment tool at the Institute of Personality Assessment and Research (IPAR). The IPAR method of assessing personality includes self-report personality and cognitive instruments, as well as observational measures. The results provide an unparalleled depth of information about the MBTI instrument and about the 16 types as seen by others. Students will be able to use the data in this book, including item and scale characteristics, correlations with a wide variety of instruments, and gender differences. Researchers and others interested in the Indicator will find this compendium an invaluable resource.