This chapter summarizes the author’s Teamology: The Construction and Organization of Effective Teams, and also describes later advances that simplify and clarify the theory. First, it develops the personality theory of psychiatrist C.G. Jung, which theorizes that people solve problems by eight mental processes called “function-attitudes” or “cognitive modes”. Then it discusses how to determine these preferred modes for each person in a group to be formed into teams. Next, ways are suggested of using this modal information to construct teams covering as many of the eight modes as possible. Finally, a novel graphical way is displayed that organizes each team to focus on every mode while reducing duplication of effort.