Introduction: Early childhood education plays an important role in shaping character, one of which is preschool self-reliant Attitude children. However, the level still varies, and the inconsistent application of learning methods can hinder the development of it. Objective: This study aims to determine the effect of a Sustainable Montessori Program (4 weeks) on Preschool Children's Self-Reliant Attitude at Kindergarten School, Ringinrejo District, Kediri Regency. Method: The study used a quantitative approach with a quasi-experimental nonequivalent control group design, involving 30 children who were divided into a control group and an experimental group. Data were collected through pretests and posttests using observation sheets and then analyzed using the Wilcoxon Test at a significance level of 0.05. Result and Discussion: This study showed an increase in Self-Reliant Attitude in the experimental group (p-value of 0.001), Conclusions: The Sustainable Montessori Program (for 4 weeks) has a significant effect on improving Self-Reliant Attitude of preschool children
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