What is it?

The Gesell Developmental Observation-Revised (GDO-R) is a comprehensive multi-dimensional assessment system that assists parents, educators, and other professionals in understanding characteristics of child behavior in relation to typical growth patterns between 2½ to 9 years of age. The GDO-R uses direct observation to evaluate a child’s cognitive, language, motor and social-emotional responses in five strands: Developmental, Letter/Numbers, Language/Comprehension, Visual/Spatial, and Social/Emotional/Adaptive. A child’s performance on each strand corresponds to a Performance Level Rating (Age Appropriate, Emerging or Concern) and a Developmental Age. The results also allow for an Overall Performance Level rating on the GDO-R while guiding the examiner to customize curricula and/or flag a child who may need additional diagnostic evaluation.

Components of the GDO-R

The components of the GDO-R assessment system include the GDO-R Examiner’s ManualGDO-R Child Recording Form (CRF), GDO-R Examiner’s Script, TQ/PQ, task manipulatives for various tasks, and an auto-calculating version of the GDO-R Strand Scoring Worksheet.  It is supported by current psychometric data published in the GDO-R Technical Report and meets the government mandates for initial screening of a child 2.5 – 9 years.

gdor strands

Get Trained

The GDO-R offers specialized training in ages and stages of development via a 3-day workshop and technical assistance not available with other data-driven instruments. Educators who attend the required GDO-R workshop view live demonstrations of GDO-R assessments, and score using real-time scenarios.  Participants become qualified examiners of the GDO-R, and become reliable at determining a child’s Developmental Age, and Performance Level Ratings across five strands.

Gesell Institute recommends best practices for assessment of very young children when using the GDO-R.