Which researcher is known for developing an intelligence assessment with a "developmental quotient" score?

The researcher known for developing an intelligence assessment that incorporates a "developmental quotient" score is Gesell. He created the Gesell Developmental Scales which are designed to assess the developmental status of children, particularly in early childhood. This scales divide developmental milestones into categories such as motor skills, language, and social behavior, allowing for a comprehensive evaluation of a child's development relative to their age.

The concept of the "developmental quotient" reflects a child's performance compared to statistical norms for their age group, which is particularly useful in identifying developmental delays or atypical development early on. This is distinct from assessments focused purely on intelligence or cognitive ability, which may not capture the full range of developmental progress in young children. The approach Gesell took emphasized the importance of recognizing that development varies significantly among children and that these variations should be understood in context rather than solely through IQ testing.