Abstract: The purpose of the current research was to investigate whether early intervention for at-risk, developmentally disabled, and typical children altered developmental trajectory. The intervention model included Risley's designed infant & toddler environments, multiple developmental assessments over time, developmentally targeted goals and objectives,and parent training. Treatment validity and concurrent validity data will be presented as will data demonstrating the extent to which continuous enrollment in the model program altered developmental trajectory of all childrenand lessened the severity of diagnoses to a statistically significant level. Data from a replication of the same model with different children, staffand parents will also be presented as this study achieved comparable results. |