The four personality types are A, B, C, and D. There is also a fifth personality type X which is for people who have two or more personality types based on a combination of qualities.
The A personality includes people who are very organized and want to be in charge. They are not necessarily detail-oriented, but are considered perfectionists. B personality individuals are fast-paced and energetic. They like to be the center of attention and are driven by that in their work. People with a C personality type are detail-oriented and rely on logic and rationality when making decisions. The D personality is for people who have an easygoing pace with work and life in general.