Limited learning media and supplementary teaching materials remain challenges in teaching fictional works in short stories, highlighting the need for practical materials that encourage active student engagement. This study aims to describe the development process and determine the validity, practicality, and effectiveness of an inquiry-based pocketbook on fictional works in short stories for eighth-grade students at SMP Negeri 1 Mandrehe Utara. The study employed a Research and Development approach using the ADDIE model, which consists of five stages: analysis, design, development, implementation, and evaluation. The participants were 21 eighth-grade students. Data were collected through observations, interviews, expert validation questionnaires, student response questionnaires, and learning outcome tests, then analyzed using quantitative descriptive techniques. The second validation stage yielded scores of 95% from the subject matter expert, 100% from the language expert, and 95% from the design/media expert, all categorized as highly valid. The practicality test yielded a score of 93%, while the average student learning outcome reached 94. These findings indicate that the inquiry-based pocketbook meets the validity and practicality criteria and has the potential to support student learning outcomes. Therefore, the product is suitable as supplementary teaching material for Indonesian language learning, particularly for fictional works in short stories. ABSTRAK Keterbatasan media pembelajaran dan bahan ajar pendukung menjadi salah satu kendala dalam pembelajaran karya fiksi dalam cerpen, sehingga diperlukan bahan ajar yang praktis dan mampu mendorong keterlibatan aktif siswa. Penelitian ini bertujuan untuk mendeskripsikan proses pengembangan serta mengetahui validitas, kepraktisan, dan keefektifan buku saku berbasis inkuiri pada materi karya fiksi dalam cerpen untuk siswa kelas VIII SMP Negeri 1 Mandrehe Utara. Penelitian ini menggunakan metode Research and Development dengan model ADDIE yang meliputi tahap analisis, desain, pengembangan, implementasi, dan evaluasi. Subjek penelitian terdiri atas 21 siswa kelas VIII. Data dikumpulkan melalui observasi, wawancara, angket validasi ahli, angket respons siswa, dan tes hasil belajar, kemudian dianalisis secara deskriptif kuantitatif. Hasil validasi tahap kedua menunjukkan persentase 95% dari ahli materi, 100% dari ahli bahasa, dan 95% dari ahli desain/media dengan kategori sangat valid. Uji kepraktisan memperoleh persentase 93%, sedangkan nilai rata-rata hasil belajar siswa mencapai 94. Hasil tersebut menunjukkan bahwa buku saku berbasis inkuiri memenuhi kriteria valid dan praktis serta berpotensi mendukung hasil belajar siswa. Produk ini layak digunakan sebagai bahan ajar pendukung pembelajaran Bahasa Indonesia pada materi karya fiksi dalam cerpen.
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