Strengthening the character of cooperation in early childhood is a strategic step in building lifelong social skills. This study aims to describe the best practice of strengthening the character of cooperation through the implementation of classroom agreements at TK Negeri 1 Alalak. This research used a qualitative approach with a case study method. Data were collected through observation, interviews, and documentation. The results showed that the participatory implementation of classroom agreements was effective in developing children's cooperative character. The children willingly and joyfully worked together to tidy up the reading corner and play equipment after use. They were able to carry out the classroom agreements that they had created together, which fostered a sense of responsibility and togetherness. Character reinforcement was consistently implemented through habitual activities, verbal praise, symbolic appreciation, and parental involvement. These findings confirm that classroom agreements can serve as an effective strategy for instilling the value of cooperation in early childhood. This study recommends the consistent and participatory application of classroom agreements in early childhood education, and further research on strengthening other characters such as independence and responsibility.
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