Background: There is an increased focus on randomized trials for proximal behavioral outcomes in early childhood research. However, planning sample sizes for such designs requires extant information on the size of effect, variance decomposition, and effectiveness of covariates. Objectives: The purpose of this article is to employ a recent large…

Shared-book reading is a well-established intervention to foster vocabulary development. Factors influencing its effectiveness are, however, less well studied, particularly with regard to story-delivery. We contrasted a read-aloud with a free storytelling approach and tested effects on vocabulary learning. In the first study, 83 preschoolers aged…

This study investigated Hong Kong and German children's perceptions of play and learning and their relationships. Forty-eight children (24 German and 24 Chinese) playing and learning in the classroom were observed and videotaped for five consecutive days. They were interviewed 3 times about their kindergarten experiences by using free- and…

New developments in the kindergartens in Greece have necessitated the availability of assessment tools that cover a wide range of children's skills and competencies that are related to the promotion of children's learning and development. The present study focuses on children's approaches to learning and aims to provide evidence for the Greek form…

Learning-related behaviors are important for school success. Socioeconomic disadvantage confers risk for less adaptive learning-related behaviors at school entry, yet substantial variability in school readiness exists within socioeconomically disadvantaged populations. Investigation of neurophysiological systems associated with learning-related…

Using a cluster randomized trial design, we evaluated the persistence of effects of a research-based model for scaling up educational interventions. The model was implemented in 42 schools in two city districts serving low-resource communities, randomly assigned to three conditions. In pre-kindergarten, the two experimental interventions were…