The role of media in the learning process, especially for early childhood education, is important for children’s language development during the preoperational thinking period. Busy Book media helps teachers learn to introduce letters and arrange letters into words. Busy Book media can motivate children, so that children do not feel bored in the learning process. in implementing the Busy Book media, the researcher adapted the RPP to the theme of vehicles, the sub-theme of two-wheeled vehicles/bicycles. Based on hypothesis testing that there is an influence of Busy Book media on the language development of children aged 5-6 years at Mutiara Bunda Kindergarten Bogo Nganjuk. Based on the average N-Gain score for the experimental class, it was 95.00% (effective) and the control class was 64.29% (quite effective). The effect size calculation shows that Busy Book Media has an influence on the language development of children aged 5-6 years at Mutiara Bunda Kindergarten Bogo Nganjuk by 62.22%.
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