The three general types of personality, according to Hans Eysenck, were neuroticism (a tendency towards emotion and "moodiness", including anxiety, fear, worry, and the like), extroversion (a person's tendency to be outgoing and relate easily to others), and psychoticism (the tendency towards a psychotic break, but also a person's aggression, tough mindedness, and anger).
These three superfactors are further split into a number of levels, but Eysenck reasoned that, using subgroups of these three traits, every person's identity could be boiled down. Other theories take into account five traits, some of them in common with Esenck's model, and Eysenck himself acknowledges the potential for more traits, but he argues that these three are the fundamental factors. He subdivides them further into a total of 27 subcategories—9 for each factor, as follows:
Psychoticism: Aggressive, assertive, egocentric, unsympathetic, manipulative, achievement-oriented, dogmatic, masculine, tough-minded.
Extroversion: sociable, irresponsible, dominant, lack of reflection, sensation-seeking, impulsive, risk-taking, expressive, active.
Neuroticism: anxious, depressed, guilt feelings, low self-esteem, moody, hypochondriac, lack of autonomy, obsessive.