Education in the 21st century is required to produce generations who have and master various kinds of skills, one of which is critical thinking skills. Therefore, learning is needed that can prepare students to think critically. One of them is applying local potential-based learning resources developed in popular scientific book teaching materials. This study aims to examine the practicality of the content, the practicality of expectations, and the actual practicality of the popular scientific books developed. The method used is based on Tessmer's formative evaluation design. The results of the research on the readability test obtained results of 87.18% with very good criteria, based on student responses, the results were 89.60% on the practicality of expectations and 92.59% on the actual practicality with very practical criteria, and based on the implementation of popular scientific books that developed which got the results of 92.59% on the implementation of expectations and 96.69% on the actual implementation with a very good category. This result shows that a popular scientific book titled "Types of Plants in the Fabaceae Family with Medicinal Properties in the Banua Botanical Gardens" is very practical to use as enrichment material in the Higher Plant Botany (BTT) course and can improve students' critical thinking skills.Abstrak Pendidikan abad ke-21 dituntut untuk dapat menghasilkan generasi-generasi yang memiliki dan menguasai berbagai macam keterampilan salah satunya adalakah keterampilan berpikir kritis. Oleh karena itu diperlukan pembelajaran yang dapat menyiapkan peserta didik untuk berpikir kritis. Salah satunya dengan menerapkan sumber belajar berbasis potensi lokal yang dikembangkan dalam bahan ajar buku ilmiah populer. Penelitian ini bertujuan untuk menguji kepraktisan isi, kepraktisan harapan dan kepraktisan actual dari buku ilmiah populer yang dikembangkan. Metode yang digunakan adalah mengacu pada desain evaluasi formatif dari Tessmer. Hasil penelitian pada uji keterbacaan mendapatkan hasil sebesar 87,18% dengan kriteria sangat baik, berdasarkan respon mahasiswa mendapatkan hasil sebesar 89,60% pada kepraktisan harapan dan 92,59% pada kepraktisan aktual dengan kriteria sangat praktis, dan berdasarkan keterlaksanaan buku ilmiah populer yang dikembangkan yang mendapatkan hasil 92,59% pada keterlaksanaan harapan dan 96,69% pada keterlaksanaan aktual dengan kategori sangat baik. Hal ini menunjukkan bahwa buku ilmiah populer dengan judul “Jenis-Jenis Tumbuhan Famili Fabaceae Berkhasiat Obat di Kebun Raya Banua” sangat praktis digunakan sebagai materi pegayaan pada mata kuliah Botani Tumbuhan Tinggi (BTT) serta dapat meningkatkan kemampuan berpikir kritis mahasiswa.
Teaching materials in learning activities have an important meaning so that the learning process is easier and more effective. Local potential can be used as a source of learning to look at phenomena, events, and problems in an area or what is also called contextual learning. The handout is one of the teaching materials that is concise and makes it easier for students to understand learning. The research method used was to analyze the results of research on proboscis monkey (Nasalis larvatus) on Curiak Island by Zainudin and Rezeki, to be used as material for the development of proboscis monkey (Nasalis larvatus) handouts on Curiak Island with the Tessmer development model which was limited to the expert stage review (Expert Test). The validation test was carried out with experts consisting of 3 (three) validators with an overall validity value of 90.6% (very valid and fit for use without revision). Its validity is shown by the average assessment on the feasibility aspect of the content of 85.07% (very valid), the assessment of the feasibility of serving 91.25% (very valid), and the assessment of the language aspect of 87.14% (very valid).Abstrak Bahan ajar pada kegiatan pembelajaran memiliki arti penting, agar proses pembelajaran lebih mudah dan lebih efektif. Potensi lokal dapat dijadikan sumber belajar melihat pada fenomena, peristiwa, maupun permasalahan pada suatu daerah yang disebut dengan pembelajaran kontekstual. Handout merupakan salah satu bahan ajar yang ringkas dan memudahkan peserta didik memahami pembelajaran. Metode penelitian yang digunakan adalah menganalisis hasil penelitian tentang bekantan (Nasalis larvatus) di Pulau Curiak oleh Zainuddin dan Rezeki, untuk dijadikan bahan pengembangan handout bekantan (Nasalis larvatus) di Pulau Curiak dengan model pengembangan Tessmer yang dibatasi hanya pada tahap expert review (Uji Pakar). Uji validasi dilakukan olehn para ahli yang terdiri dari 3 (tiga) validator dengan nilai validitas keseluruhan yaitu 90,6% (sangat valid dan layak digunakan tanpa revisi). Kevalidan ditunjukkan oleh rata-rata penilaian pada aspek kelayakan isi 85,07% (sangat valid), penilaian aspek kelayakan penyajian 91,25% (sangat valid), dan penilaian aspek bahasa 87,14% (sangat valid).
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