This study aims to describe the improvement of students’ understanding of Indonesian spelling through Project Based Learning (PjBL) based on language error analysis in the surrounding environment. This research used a qualitative descriptive approach involving 23 second-semester students of the Islamic Communication and Broadcasting Study Program at IAIN Datuk Laksemana Bengkalis. Data were collected through students’ reflection reports and analyzed using content analysis techniques. The results showed that project-based learning improved students’ understanding of capitalization, word writing, punctuation, and loanwords. Students also became more aware of the proper use of Indonesian in their surroundings. In addition, project-based learning was considered more interesting and contextual because students were directly involved in observation, analysis, and the creation of educational videos.
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