This study investigates the effectiveness of information service using a focus group discussion technique to improve students' understanding on the risks of premarital sexual behavior. It used a quantitative experiment method with one group pretest-posttest design, while its 30 subjects were selected using purposive sampling. The data analysis process was carried out using a t-test. The research results indicate improved students' understanding of the risks of premarital sexual behavior after

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... ey join information service with focus group discussion technique. Therefore, focus group discussion is effective to enhance students' understanding of premarital sexual behavior risks. Abstrak: Penelitian ini bertujuan untuk mengetahui keefektifan layanan informasi teknik focus group discussion untuk meningkatkan pemahaman resiko perilaku seksual pranikah siswa. Penelitian kuantitatif eksperimen ini menggunakan desain one group pretest posttest. Teknik pengambilan sampel menggunakan teknik purposive sampling. Sampel penelitian sebanyak 30 orang siswa. Teknik analisis data menggunakan uji beda (uji t). Hasil penelitian menunjukkan terdapat kenaikan skor pemahaman siswa tentang resiko perilaku seksual pranikah setelah diberi layanan informasi teknik focus group discussion. Dapat disimpulkan layanan informasi teknik focus group discussion efektif dalam meningkatkan pemahaman siswa tentang resiko perilaku seksual pranikah. Kata kunci: layanan informasi; teknik focus group discussion; resiko perilaku seksual pranikah