Jurnal Bimbingan dan Konseling Terapan Volume 02 Number 02 2018 ISSN: Print 2549-4511 – Online 2549-9092 http://ojs.unpatti.ac.id/index.php/bkt 178 Pengaruh Bimbingan Kelompok Terhadap Perilaku Asertif Siswa Di SMP Srijaya Negara Rani Mega Putri 1 , Tri Wahyuni 2 Universitas Sriwijaya E-mail: rani@fkip.unsri.ac.id Artikel diterima: 09 Februari 2018; direvisi 17 Maret 2018; disetujui 15 April 2018 ABSTRACT This study aims to determine the influence of group guidance on student assertive behavior in SMP Srijaya Negara Palembang. The population in this study is all students of class VII which amounted to 72 students and the sample amounted to 8 students who have low assertive behavior. The research method used is One Group Pretest-Posttest Design experiment and treatment given 3 times meeting with group guidance service. Data collection techniques used questionnaires or questionnaires. Data analysis technique using t test formula (t-test). Pre-test results showed 8 students who were subjected to the study obtained an average assertive behavior score of 98.62 included in the low category. After being given treatment or treatment of post-test result showed assertive behavior score of 8 students in high category that is average 141,75. From the results of data analysis obtained t count = 14,61 and ttable in significant level 5% that is 2,365, so that known that t count is bigger than ttable or 14,61> 2,365. It can be concluded that there is influence of group guidance on student assertive behavior in SMP Srijaya Negara Palembang. Keywords: guidance group; assertive behavior This is an open access article distributed under the Creative Commons 4.0 Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ©2018 by author. PENDAHULUAN Banyak faktor yang melatarbelakangi rendahnya perilaku asertif didalam diri individu, diantaranya yaitu karena pengaruh dari lingkungan yang kurang kondusif dan tidak mengajarkan asertivitas, pola asuh orang tua, konsep diri yang lemah, kondisi sosial budaya, jenis kelamin, usia, dan tingkat ekonomi (Hasanah, dkk., 2014). Akibat rendahnya perilaku asertif pada peserta didik ini membuat peserta didik tersebut menjadi mudah dipengaruhi oleh teman-temannya atau lingkungan di sekitarnya. Fenomena yang ditemukan penulis di lapangan banyak peserta didik di SMP Srijaya Negara Palembang memiliki perilaku asertif yang rendah, maka peneliti tertarik untuk melakukan penelitian. Hal ini dikarenakan peserta didik di SMP Srijaya Negara cenderung mudah dipengaruhi oleh lingkungan dan sulit mengekspresikan perasaan dengan jujur dan