<![CDATA[The influence of family, school and peers on students' emotional social development is very important as a starting point for the design of school activities that will also improve student development in an integral way. The Star of the Week program was developed with the aim of helping students apply the knowledge, attitudes, and skills needed to socialize and understand and manage emotions. This study uses the Thiagarajan model stages, namely define, design, develop, and disseminate (4D). The results of the validity test from the experts show that this program has workable value with 91.1% material aspects, 90% emotional development aspects and 92% presentation aspects. For the practicality test results through teacher questionnaires obtained scores of 90%, and 88.67% through teacher observations of children who are in the high practical category. The results of the program effectiveness test showed a value of 89.08% on children's social-emotional development, because it showed an increase in values before and after the intervention. The implication of further research is that it is hoped that various kinds of learning methods will develop aspects of child development based on cooperation and peer relationships. Keywords: Early Childhood, Peer Relationships, Star of the Week Program, Social Emotional References Acar, I. H., Hong, S. Y., & Wu, C. R. (2017). Examining the role of teacher presence and scaffolding in preschoolers’ peer interactions. European Early Childhood Education Research Journal, 25(6), 866–884. https://doi.org/10.1080/1350293X.2017.1380884 Acar, I. H., Rudasill, K. M., Molfese, V., Torquati, J., & Prokasky, A. (2015). Temperament and preschool children’s peer interactions. Early Education and Development, 26(4), 479–495. https://doi.org/10.1080/10409289.2015.1000718 Akhir, K., & Wisz, M. S. (2018). 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