E-book interaktif jamur merupakan inovasi bahan ajar untuk mempelajari ciri karakteristik dan peranan jamur. Penelitian ini bertujuan untuk mengembangkan e-book interaktif materi jamur untuk melatihkan berpikir kritis siswa kelas X SMA yang valid dan praktis. Penelitian ini menggunakan model pengembangan 4D (define, design, develop, dan disseminate) yang kemudian dibatasi hanya sampai tahap pengembangan. Teknik pengambilan data dilakukan dengan metode validasi, observasi, dan angket. Teknik analisis data dilakukan secara deskriptif kuantitatif. E-book interaktif yang dikembangkan diuji cobakan secara terbatas pada 20 siswa kelas X SMA Negeri 16 Surabaya. Hasil validasi e-book ditinjau berdasarkan komponen kelayakan penyajian, isi dan kebahasaan memperoleh nilai rata-rata 97,44% dengan kategori sangat valid sehingga layak digunakan dalam pembelajaran. Kepraktisan e-book ditinjau berdasarkan uji keterbacaan menunjukkan pada level 10, keterlaksanaan aktivitas siswa sebesar 98,18%, ketercapaian indikator berikir kritis sebesar 85,32% dan respons siswa sebesar 98,23% yang menunjukkan kategori sangat praktis. Dengan demikian, e-book interaktif materi jamur untuk melatihkan keterampilan berpikir kritis dinyatakan valid dan praktis digunakan dalam pembelajaran biologi.
Fungi interactive e-book is an innovative teaching material to study the characteristics and role of fungi. This reserch aims to develop an interactive e-book on fungi material to train critical thinking in class X high school students that is valid and practic. This research used 4D development model (define, design, develop, and disseminate) however this research was done until develop step. Data was collected by validation, observation, and questionnaire. The data then analyzed by descriptive technique. The interactive e-book that was developed was tested on a limited basis for 20 grade X students of SMA Negeri 16 Surabaya. The results of the e-book validation were reviewed based on the feasibility of presentation, content and language qualifications of an average grade 97,44% with a very valid category so that it was appropriate to be used in learning. The practicality of the e-book was reviewed based on the readability test, indicating at level 10, 98,18% of student activities, 85,32% of critical thinking indicator achievement and 98,07% of students' responses, which showed a very practical category. Thus, an interactive e-book on fungi material to train critical thinking skills is declared valid and practic used in learning biology.