This research aimed to analyze the improvement of students' creative thinking skills on the matter of heat and its transfer using the POGIL model. The topic concerning heat and its transfer has some characteristics that enable students to carry out practicum and trigger them to develop their higher-order thinking skills. The method used in this research was pre-experimental with one group pretest-posttest design. A total of 32 seventh grade students at SMPN 1 Jaten Karang Anyar, Central Java, were randomly selected as the participants in this research. To measure the increase in students' creative thinking skills, a multiple-choice test had been developed based on the indicators of creative thinking skills. Based on the results of data analysis, the values of N-gain on the indicators consisting of fluency, flexibility, originality, and elaboration were 0.56, 0.60, 0.46, and 0.53 respectively. Those numbers meant that creative thinking was in the medium category. Further analysis shows that, by using the POGIL model on the topic of heat and its transfer learning, students' creative thinking skills can be increased, especially on the indicators of fluency and flexibility.

This study aimed to know the profile of students’ creative thinking skills in grade VII of junior high school during the process of science learning. This study was carried out using quantitative-descriptive method. Data collection were done by using open-ended multiple-choice tests based on students’ creative thinking skills indicators. The test was previously validated by learning evaluation experts. Validity of test items were determined using Karl-Pearson formula related to product moment correlation coefficient. Reliability of tests were determined using Alpha-Cronbach formula. Difficulty level and discriminating power were also used as item parameters development of test instruments in this study. The sample taken in this study was 256 students which consisted of all seventh grade students in SMP Negeri 1 Jaten selected through purposive sampling technique due to identify students’ creative thinking skills. The results of this study showed that students’ creative thinking skills on each indicator were 49% of fluency which was in the low category, 72% of flexibility which was in the medium category, 34% of originality which is in the low category, and 35% of elaboration which is in the low category. The conclusion from this research is that creative thinking skill of the students still was in low category, so that needed a way to enhance it on some indicators.