This study aims to describe the thinking processes of sixth-grade students at SDN Nguken in understanding and determining the main idea of informative texts. A qualitative approach with a case study design was employed. The participants were one classroom teacher and eight sixth-grade students, purposively selected based on the teacher’s recommendation and the students’ difficulties in identifying main ideas. Data were collected through classroom observations, semi-structured interviews with the students and the teacher, and documentation, using observation and interview guidelines. The data were analyzed through data reduction, data display, and conclusion drawing and verification, and their validity was established through technique triangulation, source triangulation, and member checking. The findings show that the students’ thinking processes involved understanding the text, identifying important information, connecting information across sentences, determining the idea representing the paragraph, and reviewing their decisions. The students applied strategies such as reading the whole text, identifying important information, examining relationships among sentences, and rereading the text.
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