The purpose of the Promoting Communication with Infants and Toddlers project was to translate developmental research on language promoting techniques into practice through interventions that focus on the delivery of effective evidence-based practices by caregivers in the context of inclusive community-based programs. In this randomized clinical trial we demonstrated that children in an intervention group whose caregivers used the language-promoting strategies with a high degree of fidelity were more likely to demonstrate higher rates of communication growth than children in the control group The infants and toddlers in those intervention classrooms had rates of language growth that significantly exceeded those of the children in the comparison classrooms who did not receive the intervention.
Walker, D. Bigelow, K. Harjusola-Webb, S. (2008). Increasing communication and language-learning opportunities for infants and toddlers. Young Exceptional Children Monograph Series #10, 105-121.