This study aims to determine the significant effect of social skills training on cooperating with children in group B Diponegoro Kindergarten, Buleleng District, in Academic Year 2019/2020. This research is quasi-experimental research using a Non-Equivalent Pretest-Posttest Control Group Design research design. The study population were all group B of Diponegoro Kindergarten, Buleleng District, with 69 students. The sample is determined by the cluster random sampling technique. The sample in

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... s study amounted to 33 students. Data on the ability to cooperate were collected by observation techniques analyzed using descriptive statistical analysis techniques and inferential statistics t-test. The analysis results obtained t-count = 23.425 while at a significance level of 5% with degree of freedom = 31 obtained ttable = 2.039 t count = 23.425> t table = 2.039. Based on the testing criteria, then H0 is rejected, this means that the HA hypothesis is accepted, which states that there is a significant influence between groups of children who receive social skills training learning and groups of children who do not receive social skills training learning towards collaborative skills in Group B Kindergarten children Diponegoro 2019/2020 Academic Year. The average value of working together in groups that receive social skills training learning is 41.12, while the average value in groups that do not get social skills training is 19.12. The results it can be concluded that there is a significant influence on the ability of cooperation between groups of children who receive social skills training learning with groups of children who do not get social skills training learning on collaborative skills in group B Diponegoro Kindergarten in Buleleng Regency in Academic Year 2019/2020.