Studi penelitian deskriptif tentang penggunaan media pembelajaran yang berbeda berupa media segar dan media gambar, untuk menganalisis peningkatan kemampuan tree thinking siswa SMA dalam mempelajari konsep Klasifikasi Makhluk Hidup, khususnya klasifikasi Invertebrata kelompok Protostome. Penelitian ini melibatkan sejumlah siswa SMA-Y di Kabupaten Bandung Barat (KBB) (n=29) dan sejumlah siswa SMA-X di Kota Bandung (n=17). Waktu Penelitian dilakukan pada bulan April s.d Juli tahun 2019. Instrumen yang digunakan dalam penelitian, meliputi: instrumen analisis potensi masalah, three tier multiple choice test, tes penilaian kinerja, quesioner atau angket tanggapan guru dan siswa terhadap pembelajaran, serta lembar observasi keterlaksanaan pembelajaran. Penelitian terdiri dari dua tahapan, yaitu penelitian tahap 1 dan penelitian tahap 2. Penelitian tahap 2 dilakukan untuk memperbaiki keterbatasan dan meminimalisir masalah yang terjadi pada penelitian tahap 1. Prosedur penelitian meliputi: analisis potensi masalah, studi literatur, rancangan dan validasi instrumen, serta pelaksanaan dan pelaporan penelitian. Hasil penelitian menunjukkan keterlaksanaan tahapan RPP dengan kriteria baik (50% pada penelitian tahap 1 dan 60% pada penelitian tahap 2). Peningkatan kemampuan tree thinking siswa masih dalam kriteria rendah (g0,3), meliputi: menentukan hubungan filogenetik (1), menerapkan konsep klad (2), mengidentifikasi jumlah perubahan evolusi (3), dan mengurutkan evolusi karakter spesies (4). Untuk indikator menentukan MRCA (5), sister group (6), topologi pohon (7), dan pembuatan pohon filogenetik (8), diperlukan latihan berulang agar siswa lebih memahaminya. Sementara itu, guru dan siswa menanggapi kegiatan pembelajaran dengan positif, baik pada penelitian tahap 1 maupun penelitian tahap 2. Descriptive research studies on the use of different learning media in the form of fresh media and picture media, was carried out to analyze the enhancement of student's tree thinking on the concept of Living Things Classification, specifically the Invertebrate classification on the Protostome group. The research was involved a number of SMA-Y Kabupaten Bandung Barat (KBB) (n = 29) and a number of SMA-X Kota Bandung (n = 17). Research was conducted on April until July 2019. The instruments used on the study included: instruments for analyzing potential problems, three tier multiple choice tests, performance assessment tests, questionnaires of teacher and student responses to learning, and observation sheets for the implementation of learning. The research consists of two stages, namely phase 1 and phase 2 research. Research phase 2 was conducted to improve the limitations and minimize problems that occur in research phase 1. Research procedures include: analysis of potential problems, literature study, design and validation of instruments, and implementation and research reporting. The results showed the implementation stages of the RPP was good criteria (50% on phase 1 research, and 60% on phase 2 research). Improvement of student's tree thinking was still in low criteria (g 0.3), including: analyze phylogenetic relationships (1), applying the clade concept (2), identifying the number of evolutionary changes (3), and sorting character evolution species (4). Indicators analyze MRCA (5), sister group (6), tree topology (7), and constructing phylogenetic tree (8), repeated training was needed so that students better understand them. Meanwhile, teachers and students responded positively to learning activities in both phase 1 and phase 2 research
