Effects of a 1-semester professional development (PD) intervention that included expert coaching with Head Start teachers were investigated in a randomized controlled trial with 88 teachers and 759 children. Differential effects of technologically mediated (remote) versus in-person (on-site) delivery of individualized coaching with teachers also were examined in a random assignment design. Hierarchical linear model analyses revealed positive PD intervention effects on general classroom environment (d ϭ 0.99) and classroom supports for early literacy and language development (d ϭ 0.92), and on children's letter knowledge (d ϭ 0.29), blending skills (d ϭ 0.18), writing (d ϭ 0.17), and concepts about print (d ϭ 0.22). No significant intervention effects on teaching practices and children's outcomes related to oral language were found. There were no differential effects of remote versus on-site delivery of literacy coaching.

Only true experiments offer definitive evidence for causal inferences, but not all educational interventions are readily amenable to experiments. Correlational evidence can at least tentatively inform evidence-based practice when sophisticated causal modeling or exclusion methods are employed. Correlational evidence is most informative when exemplary practices are followed as regards (a) measurement, (b) quantifying effects, (c) avoiding common analysis errors, and (d) using confidence intervals to portray the range of possible effects and the precisions of the effect estimates.

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This research examines the relationships between participation in an inclusive preschool program, children's understanding of disabilities, and their acceptance of children with disabilities. Subjects were preschool children enrolled in regular ( n = 31) and inclusive ( n = 29) programs. Children's understanding of competencies associated with specific disabilities, and their general acceptance of others, were assessed using interview questions and dolls. Children were interviewed to learn their ideas about the immediate and long-term consequences of physical and sensory disabilities. In addition, children provided ratings of the social acceptance of hypothetical children with and without disabilities. Children in inclusive classes had more knowledge about long-term consequences of disabilities than did children in regular preschool classes. In addition, children in inclusive settings gave significantly higher acceptance ratings to children with and without disabilities than did children in regular preschool classes. Finally, it was found that children's knowledge of disabilities, their overall acceptance of individuals without disabilities, and their participation in an inclusive class contributed significantly and independently to their acceptance of children with disabilities.