Who was the first to identify observable behaviors that reflect social development? A. Jean Piaget B. Mildred Parten C. Howard Gardner D. Erik Erikson

The first psychologist who identified observable behaviors that reflect social development was B. Mildred Parten. In 1929, she developed a theory of children's participation in play developed that called 'Stages of play'. She recongized six types of play that reflect social development of a child and explain its behaviour at a particular stage of its life.