Critical thinking skills are among the main skills in the 21st Century. However, many schools in Indonesia have not trained their students' critical thinking skills optimally. The purpose of this study was to identify the quality of high-school students' critical thinking skills. A survey was conducted to 175 tenth graders who were registered in…

Three-year longitudinal and concurrent associations of leadership with overt aggression, exclusion of others, effortful control (EC), popularity, unpopularity, prosocial behavior, and academic achievement were assessed in this study of Indonesian adolescents. Participants were initially assessed in the 10th grade (n = 462, 256 girls; M[subscript…