SMAN 1 Tasikmalaya organizes education and learning that leads to 21st Century skills. One of the 21st Century skills developed is students' critical thinking skills. The critical thinking skills of class XI MIPA 1 student in the 2021/2022 Academic Year, especially in learning biology based on the results of interviews with biology subject teachers, still need to be improved, this is confirmed by the results of the students' critical thinking skills test with an average of 49.85 with the category still underdeveloped. The purpose of the study was to determine the role of Blended-Problem Based Learning with integrated social media-based learning media in improving critical thinking skills of class XI MIPA 1 student. This research was a Classroom Action Research based on Lesson Study. Data on critical thinking skills were obtained using a critical thinking test with essay type questions. Data on students' critical thinking skills test results were analyzed descriptively qualitatively by referring to the Illinois Critical Thinking Essay Test. The results showed that the critical thinking test results for students in cycle I and cycle II had increased by 9.83%, which means that the critical thinking skills of class XI MIPA 1 student in the 2021/2022 Academic Year had developed well in learning biology using Blended-Problem Based Learning with integrated social media-based learning media.

This study aims to investigate the effect of implementing problem-based learning in lesson study on students' critical thinking skills, especially of the topic human respiratory system. The research method used is a true experiment with a posttest-only control design. The population in this study were students of class XI MIPA SMAN 1 Tasikmalaya which consisted of 8 classes with a total number of students was 273. The samples used in this study were 2 classes, class XI MIPA 8 an experimental class with 35 students, and class XI MIPA 7 a control class with 33 students. The sampling technique was carried out by cluster random sampling technique. Data collection techniques in the form of critical skills test a total of 15 things. The instrument is used to test critical thinking skills on the material of the human respiratory system. The data analysis technique was carried out by using a t-test. The results significance value is 0.023<0.05 can be said that there is an effect of problem-based learning models on students' critical thinking skills in the human respiratory system

<p>This study is aimed to improve critical thinking ability of the X-1 class of SMA N 3 Surakarta through the implementation of Blended-Problem Solving through Moodle application. This research was a classroom action research that divided into several cycles, each cycle includes four stages: planning, action, observation, and reflection. The subject of this research was the students of X-1 class at SMA N 3 Surakarta in academic year of 2012/2013. The data was obtained through the test (essay test) and non-test (interviews and documentations). And be analyzed with descriptive analytical techniques then validated by triangulation techniques. The results showed that students critical thinking ability was increased in Pre-cycle, Cycle I, and Cycle II. Critical thinking consist of six aspects are interpretation, analysis, evaluation, inference, explanation, and self-regulation. The improvement in interpretation aspect increased from 42,19% to 66,41%. Analysis aspect increased from 36,72% to 78,13%. Evaluation aspect increased from 33,59% to 78,91%. Inference aspect increased from 40,63% to 64,06%. Explanation aspect increased from 30,47% to 73,44%. Self-regulation aspect increased from 43,75% to 78,91%. The conclusion of this study explained that the implementation of Blended-Problem Solving with moodle could improve critical thinking ability of the X-1 class at SMA N 3 Surakarta.</p><p align="center"> </p><p class="0jTULISANKATAKUNCIKEYWORDS">Key Words: Blended-Problem Solving, Moodle, Critical Thinking</p>

The development of information technology is increasing rapidly in the era of globalization, making educators required to adapt to technological developments, one of which is by learning interactive quizzes. This study aims to determine the interactive quiz media using the Kahoot application on student learning outcomes on the material of the human excretory system in Class XI MIPA SMAN 10 Tasikmalaya Academic Year 2021/2022. The research method uses a quasi-experimental research design with Nonequivalent Pretest-Posttest Control Group Design. The population in this study were all class XI MIPA SMAN 10 Tasikmalaya, as many as four classes totalling 141 students. The sampling technique used is purposive sampling, with the sample used class XI MIPA 2 as the experimental class and XI MIPA 3 as the control class with several students 71 people. The instrument used in this study was to measure student learning outcomes through a multiple-choice test of 30 questions referring to indicators C1, C2, C3, C4, and C5. The data analysis technique used is the independent t-test. The results showed a significant effect of the interactive quiz method using the Kahoot application on student learning outcomes with a significance value (of 0.002). These positive results can be used as a reference for educators to use Kahoot in supporting teaching and learning activities