This methodology report documents the design, development, and psychometric characteristics of the assessment instruments used in the preschool and kindergarten waves of the ECLS-B. The assessment instruments measure children's cognitive development in early reading and mathematics, socioemotional functioning, fine and gross motor skills, and physical development (height, weight, middle upper arm circumference, and head circumference). The report also includes information about indirect assessments of the children through questions asked of parents, early care and education providers, and teachers.
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