Technical Report

The Gesell Developmental Observation-Revised (GDO-R) Technical Report is the first comprehensive technical publication for the GDO assessment instrument since 1979. The report is intended for both teachers and administrators. Its ultimate purpose is helping to inform curriculum development

It is based on a sample of assessment data for developmental and achievement tasks for children in preschool and Kindergarten. Readers of this Technical Report should possess an advanced understanding of appropriate use and application of assessment tools, methods for conducting test development and methodology in statistics and measurement.

The results of the 1979 study were published in School Readiness; Behavior Tests used at the Gesell Institute.

GDO Study Reliability and Validity Evidence Executive Summary