1921
Cattell
Eysenck
Carl Jung
Phrenology
Used a two-dimensional scale with the axis Extrovert, Introvert, Stable and Neurotic
Two mutually exclusive personality types. People are energized by either the external world or internal world
Goldberg
Used a mathematical technique (factor analysis) to group people together
Measuring personality by assessing the patterns of bumps on people’s skull
1940
1965
1993
1840
Narrowed the fundamental factors into The Big Five: Extroversion, Agreeableness, Conscientiousness, Neuroticism, Openness to experience
