A nursery school teacher who was comparing a group of 3-year-olds in terms of such physical skills as walking, running, and skipping might use as a reference:

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Gesell's statistical norms are used to compare children in terms of physical development, including skills like walking, running, and skipping. Arnold Gesell developed a set of norms to describe the typical sequence and rate of childhood development, which can serve as a reference for evaluating individual children's physical skills.

A Nursery School Teacher Who Was Comparing a Group of 3-Year-Olds