Penelitian ini dilaksanakan bertujuan untuk mendeskripsikan hasil keterlaksanakan, peningkatan keterampilan proses sains siswa, serta respon siswa setelah diterapkannya model pembelajaran inkuiri terbimbing pada materi getaran harmonis. Penelitian dilaksanakan di SMA Negeri 1 Arosbaya dengan tiga kelas sebagai sampel, dimana satu kelas sebagai eksperiman dan dua kelas replikasi yang dipilih secara purposive sampling, dengan jenis penelitian yang digunakan adalah pre Experiment design. Metode penelitian yang digunakan adalah observasi, tes, dan angket. Instumen tes yang digunakan berupa soal uraian yang dikerjakan oleh siswa sebelum dan sesudah pembelajaran.

Berdasarkan hasil uji normalitas dan homogenitas, kelas eksperimen dan kelas replikasi terdistribusi normal dan homogen. Hasil penelitian menunjukkan bahwa: 1) keterlaksanaan pembelajaran pada ketiga kelas disetiap pertemuannya berategori sangat baik berdasakan  fase pembelajaran, 2) hasil keterampilan proses sains siswa meningkat setelah diterapkan model pembelajaran inkuiri terbimbing, 3)berdasaran hasil anget respon, siswa memberikan tanggapan sangat baik terhadap pembelajaran inkuiri terbimbing.

Kata kunci : Model Pembelajaran Inkuiri Terbimbing, Keterampilan Proses Sains, Getaran Harmonis

This study was conducted to describe the improvement of students' science process skills, and student responses after the implementation of guided inquiry learning models on harmonious vibration material. The research was conducted at Senior High School 1 of Arosbaya with three classes as samples, where one class as an experiment and two as the replication classes. The samples were selected purposively,  this research was pre- experimental research. The data were collected by  observation, tests, and questionnaires. The test used in the form of a description question which is done by the students before and after learning process

Based on the normality and homogeneity test, the result showed that both experimental and replication class were normal and homogeneous distributed. The results of this research showed that: 1) based on the learning phase the implementation of learning process in all three classes in each meeting were categorized very good  , 2) the results of students' science process skills improved after the implementation of guided inquiry learning models were applied, 3) based on the result of the questionnaire regarding to the implementation of guided inquiri, the students give very good respons.

Keywords: Guided Inquiry Learning Model, Scientific Process Skills, Vibartion of Harmoni