Which theorists described easy, difficult, and slow-to-warm-up children?

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Thomas and Chess described different temperament types in children, including easy, difficult, and slow-to-warm-up. Buss and Plomin focused on genetic and environmental influences on personality, Freud and Erikson focused on psychosexual and psychosocial development, Skinner and Bandura focused on behaviorism and social learning theory, and Piaget and Vygotsky focused on cognitive development.

Which Theorists Described Easy, Difficult, and Slow-To-Warm-Up Children