After presenting a brief rundown of 20th-century psychology movements, Keirsey and Bates encourage you to take the 70-question "Keirsey Temperament Sorter," a sort of mini-Myers-Briggs test that places you in 1 of 16 personality types. Like the Myers-Briggs system, this test sorts your personality into groups of extraversion/introversion (E/I), sensation/intuition (S/N), thinking/feeling (T/F), and perceiving/judging (P/J). Unlike the Myers-Briggs system, Please Understand Me also presents four easy-to-remember temperament types -- Dionysian (freedom first), Epimethean (wants to be useful), Promethean (desires power), and Apollonian (searches for self) -- that underlie the 16 possible personalities identified by the test. The book then delves into a detailed analysis of each type, with sections on mates, children, and leaders. An appendix paints portraits of the 16 possible personality types.