Costa and McCrae are psychologists known for developing the Five Factor Model of personality, also referred to as the Big Five. This model identifies five key traits: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Their research emphasizes that these traits exist on a continuum and can help predict behavior and preferences. Their work has significantly influenced psychology, providing a framework for understanding personality. The Big Five traits are widely used in various fields, including psychological assessment, career counseling, and relationship studies. This model is appreciated for its empirical support and applicability across different cultures.