<![CDATA[This study aims to describe 1). Validity of microsite learning media. 2). The practicality of microsite learning media, and 3) analyzing student learning outcomes. The research used a limited test on 20 respondents in class X.E in the even semester of SMA Negeri 1 Paguyaman for the 2024/2025 school year. The type of development research uses the ADDIE model. The results of the research showed that the validity of the media was 92.41% (very valid), the validity of the material was 89.47% (very valid), and the validity of the questions was 91.42% (very valid). The practicality test consisted of a teacher response of 95.5% (very practical) and a student response of 92.76% (very practical). The student learning outcome test was obtained from the results of the pretest and posttest evaluation, which was then analyzed using N-Gain, obtaining an average score of 0.41 (moderate). Based on the results of the description of all the percentage values, it shows that "the development of microsite-based learning media for research on environmental change and conservation at SMA Negeri 1 Paguyaman" has met the criteria for being suitable for use in learning biology of environmental change and conservation materials. Abstrak. Penelitian ini bertujuan untuk mendeskripsikan 1). Validitas media pembelajaran microsite. 2). Kepraktisan media pembelajaran microsite, dan 3) menganalisis hasil belajar peserta didik. Penelitian menggunakan uji terbatas pada 20 responden kelas X.E semester genap SMA Negeri 1 Paguyaman tahun ajaran 2024/2025. Jenis penelitian pengembangan menggunakan model ADDIE. Hasil penelitian, validitas media 92,41% (sangat valid), validitas materi 89,47% (sangat valid) dan validitas soal 91,42% (sangat valid). Uji kepraktisan terdiri dari respon guru 95,5% (sangat praktis), dan respon siswa 92,76% (sangat praktis). Tes hasil belajar siswa diperoleh dari hasil evaluasi pretest dan postest yang kemudian dianalisis menggunakan N-Gain, memperoleh nilai rata-rata 0,41 (sedang). Berdasarkan hasil uraian seluruh nilai presentase tersebut, maka menunjukkan bahwa “pengembangan media pembelajaran berbasis microsite materi perubahan dan pelestarian lingkungan hidup penelitian di SMA Negeri 1 Paguyaman” telah memenuhi kriteria layak digunakan pada pembelajaran biologi materi perubahan dan pelestarian lingkungan hidup.]]>
