<![CDATA[One aspect of building quality human beings is discipline. Schools not only provide knowledge to students but also build students to become disciplined individuals. This classroom action research aimed to determine the effectiveness of liaison books in increasing student discipline in class attendance, extra-curricular activities, doing assignments/work, and ethical manners at school. The research subjects were students of class XI at State Senior High School 9 Bengkulu City. Classroom action research was carried out for two months in the 2022/2023 school year. Each cycle consists of four stages: planning, implementation, evaluation, and reflection. Data were obtained from 99 sample students using observation, interview, and documentation techniques for the research instruments that had been prepared. The average data were analyzed qualitatively to define the success of the action. The results showed that the liaison book at the end of the third cycle improved student discipline in class attendance, extra-curricular activities, doing assignments/work, and ethical manners at school to good criteria with a score of 4.1. Thus, liaison books can effectively improve student discipline, so liaison books between schools and parents must be used to collaborate in children's education.]]>
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