Authors Avril Thorne and Harrison Gough review and discuss more than 30 years of research with the Myers-Briggs Type Indicator 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 the 16 personality types as observed by others. Students can use the information as a basis for understanding characteristics and tendencies of personality types. Researchers and others interested in the MBTI instrument will find the data in this book an invaluable resource.