3 concepts
The Big Five Personality Traits
The Big Five personality traits are openness, conscientiousness, extraversion, agreeableness, and neuroticism.
The Myers-Briggs Personality Types
The Myers-Briggs Type Indicator is a commonly used personality test exploring 16 personality types.
Other Important Trait Theories
The disposition theory, three fundamental traits, and HEXACO model of personality structure are applicable to the work place.