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The aim of this paper was to validate the Interaction Rating Scale for Children (IRSC) as an evidence-based practical index of social skills. Twenty 5–6-year-old preschool students participated in our study. Participants were required to complete a 5-minute interaction session and were evaluated using the IRSC. A motion capture machine, based on an ecologically valid interaction within a candy-distribution setting, monitored participants’ head movements. Results indicated a moderately high correlation between IRSC scores and head movements. When cooperation was high, the “Pitch” was higher (r= 0.548, p<. 05) and the “Yaw” was lower (r=-0.685, p<. 01). When self-control was high, the “Pitch” was lower (r=-0.576, p<. 01). The IRSC is able to measure social competence with high validity. Thus, the IRSC is a helpful tool for understanding the development of peer relationships.