The author points out that this tool was developed during World War II to be administered to military soldiers. This test is used to classify individuals into 16 profiles of personality traits such as emotional stability, impulsivity and conformity. Furthermore, the 16PF has second-order factors: extraversion, anxiety and independence. This test is still widely used by companies and institutions to determine people's compatibility for certain jobs based on their psychological characteristics. This is a reference book for high school and college students who need accessible definitions and details of important psychological concepts. Each topic was evaluated by a review committee composed of professors and scholars in the field of psychology. I plan to use this source for major elements of the 16PF not found in others