<![CDATA[This research is motivated by the low self-confidence of some students at SMA Negeri 3 Mandrehe Utara, which is characterized by hesitation in expressing opinions, a tendency to avoid presentations in front of the class, and an inferior attitude in social interactions. This study aims to determine the significant effect of group guidance services with reinforcement techniques in increasing the self-confidence of students at SMA Negeri 3 Mandrehe Utara. The study used a quantitative approach with a pre-experimental design, a one-group pretest-posttest design. The research subjects were 22 students who were determined based on the results of the initial screening of self-confidence levels. Data collection was carried out using a self-confidence questionnaire and group guidance with reinforcement techniques that had been tested for validity and reliability. Data were analyzed using the Shapiro-Wilk normality test, paired sample t-test, and the R2 Determinant Coefficient Test. The results showed that the average self-confidence score increased from 30.00 in the pre-test to 45.00 in the post-test. The results of the paired sample t-test obtained a calculated t value of 21.447, greater than the t table of 2.080 with a significance of 0.000 (<0.05), so Ha is accepted and Ho is rejected. The coefficient of determination also shows a value of 0.859 or 85.9%, which is included in the Very High category (0.801.00). It can be concluded that group guidance services with reinforcement techniques have a significant effect on increasing student confidence at SMA Negeri 3 Mandrehe Utara. The results of this study recommend that group guidance services with reinforcement techniques be made a routine program by guidance and counseling teachers in dealing with student self-confidence problems. ABSTRAK Penelitian ini dilatarbelakangi oleh rendahnya percaya diri sebagian peserta didik di SMA Negeri 3 Mandrehe Utara, yang ditandai dengan keraguan menyampaikan pendapat, kecenderungan menghindari presentasi di depan kelas, dan sikap minder dalam interaksi sosial. Penelitian ini bertujuan untuk mengetahui pengaruh yang signifikan layanan bimbingan kelompok dengan teknik reinforcement dalam meningkatkan percaya diri peserta didik di SMA Negeri 3 Mandrehe Utara. Penelitian menggunakan pendekatan kuantitatif dengan jenis pre-experimental design, bentuk one group pretest-posttest design. Subjek penelitian berjumlah 22 peserta didik yang ditentukan berdasarkan hasil skrining awal tingkat kepercayaan diri. Pengumpulan data dilakukan menggunakan angket percaya diri dan bimbingan kelompok dengan teknik reinforcement yang telah diuji validitas dan reliabilitas. Data dianalisis menggunakan uji normalitas Shapiro-Wilk, uji paired sample t-test, dan Uji Koefisien Determinan R2. Hasil penelitian menunjukkan rata-rata skor percaya diri meningkat dari 30,00 pada pre-test menjadi 45,00 pada post-test. Hasil uji paired sample t-test memperoleh nilai t hitung sebesar 21,447 lebih besar dari t tabel 2,080 dengan signifikansi 0,000 (< 0,05), sehingga Ha diterima dan Ho ditolak. Nilai koefisien determinasi juga menunjukkan nilai sebesar 0,859 atau 85,9%, yang termasuk dalam kategori Sangat Tinggi (0,80 - 1,00). Dapat disimpulkan bahwa layanan bimbingan kelompok dengan teknik reinforcement berpengaruh signifikan dalam meningkatkan percaya diri peserta didik di SMA Negeri 3 Mandrehe Utara. Hasil penelitian ini merekomendasikan agar layanan bimbingan kelompok dengan teknik reinforcement dijadikan program rutin oleh guru bimbingan dan konseling dalam menangani permasalahan kepercayaan diri peserta didik.]]>
