Penelitian ini bertujuan untuk mengetahui kelayakan ensiklopedia simbol-simbol fisiska pada materi cahaya dan optik untukmeningkatkan pemahamn konsep siswa. Penelitian ini merupakan jenis penelitian Research and Development (R&D). Model pengembangan yang digunakan adalah model ADDIE dengan tahap analysiz (analisisi), design (desain), development (pengembangan), implementation (implementasi). dan evaluation (evaluasi). Produk diuji cobakan kepada siswa kelas VIII–A MTs Sunan Ampel Ringinrejo Kediri pada tahun ajaran 2018/2019. Berdasarkan hasil penelitian dapat disimpulkan bahwa hasil penilaian respons siswa sebesar 86,11% dengan kriteria sangat baik. Kata Kunci: ensiklopedia, pengembangan, cahaya dan optik

This study aimed to determine the media feasibility of The Development of Physics Symbols Encyclopedia on Light and Optic subject matter of the Eighth Degree Students to Improve Concept Understanding of Student. This research is a type of Research and Development (R & D) research. The development model used is the ADDIE model with the analysiz (analysis) stage, design (design), development (development), implementation (implementation). and evaluation (evaluation). The product was tested on students of class VIII-A MTs Sunan Ampel Ringinrejo Kediri in the 2018/2019 school year. Based on the results of the study it can be concluded that the results of student response assessment amounted to 86,11% with very good criteria criteria. Keywords: encyclopedia, development, Light and Optic

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