Which researcher developed the categorizaiton scheme for five categories of play varying in social complexity?

Name: Which researcher developed the categorizaiton scheme for five categories of play varying in social complexity?
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Mildred Parten is the researcher who developed the categorization scheme for five categories of play that vary in social complexity. Her categories are unoccupied play, solitary play, onlooker play, parallel play, and cooperative play.

Which Researcher Developed the Categorizaiton Scheme for Five Categories of Play