Investigators have defined three temperamental clusters of children's behavior.They include:

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The three temperamental clusters of children's behavior are the "easy," "difficult," and "slow-to-warm-up" child. This classification was developed by the researchers Alexander Thomas and Stella Chess in their longitudinal study of infant development. The "easy" child is typically regular in their biological rhythms, adaptable, and positive in mood. The "difficult" child tends to have intense reactions to stimuli, irregular biological rhythms, and negative moods. The "slow-to-warm-up" child may be withdrawn, shy, and take time to adapt to new situations.

Investigators Have Defined Three Temperamental Clusters of Children's Behavior