Penelitian ini dilakukan untuk mengetahui pengaruh model pengatur kemajuan (advance organizer) berbasis proyek terhadap kemampuan analisis â sintesis siswa pada konsep Energi. Sebelum pembelajaran, diberikan tugas proyek pada siswa untuk merealisasikan bel listrik sederhana, rangkaian arus seri - paralel, dan tuas. Produk proyek digunakan sebagai advance organizer dalam pembelajaran di kelas. Penguatan kognitif dilakukan melalui diskusi kelompok dan pembuatan peta konsep, ekspositori guru di kelas, dan kegiatan eksperimen laboratorium. Data diambil melalui pretest, post test, observasi partisipatif pembelajaran oleh dua orang observer, penilaian produk, peta konsep dan laporan kegiatan eksperimen. Teknik analisis data meliputi uji prasyarat data dan uji hipotesis Hasil penelitian menunjukkan bahwa siswa mengalami peningkatan kemampuan analisis â sintesis dalam aspek menguraikan, mengkategorikan, mengidentifikasi, merumuskan pernyataan, merekonstruksi, menentukan konsep, dan menganalisis konsep dengan rata â rata peningkatan delta skor sebesar 54,46 %, uji t sebesar 6,4, dan skala gain sebesar 0,3. This study was conducted to determine the effect of project-based advance organizer model on studentâs analysis - synthesis ability of the energy concept. Students were given an assignment to realize the project on simple electric bell, the series â parallel circuit, and lever, before learning. The products of project were used as an advanced organizer in the learning activity. Cognitive strengthening was done through group discussions and concept mapping, expository learning in the classroom, and laboratory experiments activities. The data were taken through a pretest, post-test, participant observation study by two observers, product assessment, concept maps and report of experiment activities. Results showed that the studentsâ analysis - synthesis ability increased in the aspect of describing, categorizing, identifying, statement formulating, reconstructing, concept determining, and analyzing the concept. The average increase in delta score was 54.46 %, while the t-test score was of 6.4 and a gain scale of 0.3.