Daniel Goleman popularized the concept of emotional intelligence in his 1995 best-selling book. He adapted the work of Mayer and Salovey, who in the early 1990s proposed emotional intelligence as a new variable in personality involving the ability to perceive and understand emotions. Goleman generalized their research for a general audience and proposed emotional intelligence involves five competencies: self-awareness, self-management, social awareness, relationship management, and motivation. While popularizing the concept, Goleman's definition differed from the original and sparked debate. Measures of emotional intelligence aim to directly assess one's capacity for skills like identifying emotions in others and managing one's own emotions. Proponents argue emotional skills may be more important than