CDC and TOG Research
The brief Child Development Chart and longer Teacher’s Observation Guide both include developmental skiills with age norms that have been derived from research with the Child Development Inventories. Each developmental skill is placed at the age level by which 75 percent of children from the CDI norm group achieved that skill. These direct observation tools have not been validated against direct developmental test results such as the Bayley Scales.
The Parent Questionnaires that include these charts on the back have been validated.
We welcome research and will fully support it.