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The research has been carried out at the Islamic junior high school of East Lampung to determine the effectiveness of the Connecting, Organizing, Reflecting, and Extending (CORE) learning model on students' creative thinking skills on sound waves topic. The research method used was a quasi-experimental design with Non-Equivalent Control Group Design. Data on creative thinking skill were collected using essay test instrument. This research was conducted on the eighth-grade students of an Islamic senior high school in East Lampung with a sample of 60 students taken by using purposive sampling technique. Based on the Effect Size test, the effectiveness value of the CORE model on students' creative thinking skills are 0.48 which is in the medium category. These results prove that the CORE learning model is effective in enhancing students' creative thinking skills on sound wave material. This study also provides a storyboard on how to apply an effective CORE model to improve students' creative thinking abilities.

Industrial revolution 4.0 is currently present in various countries, including Indonesia. Indonesia responded quickly through technological developments, especially education. The actions of the Indonesian government to deal with industrial 4.0 are contained in the 4C principle, one of which is Critical Thinking. The Science, Technology, Engineering, and Mathematics (STEM) learning approach has become an alternative in building critical thinking skills, especially in science learning. The purpose of this study is to quantitatively measure the impact of the STEM-inquiry model based on the K-13 Indonesian Curriculum towards critical thinking skills of 15-16 years old students. This study employed quasi-experimental with non-equivalent control group design at SMAN 1 (State Senior High School) Padang Cermin, Lampung, Indonesia. The research subjects consisted of 50 students. The critical thinking skill was measured through 10 items of an essay question on the momentum and impulse material. Based on the results of the non-parametric statistical hypothesis test Mann Whitney, the significance level of 0.004 was obtained (sig <0.05). The results of the hypothetical test showed that the student's critical thinking skills before and after using the STEM-based inquiry model were different. It can be concluded that the application of the STEM-based inquiry model was effective in increasing students' critical thinking skills.

The identification of students' mental models is crucial in understanding their knowledge of scientific concepts. This research aimed to develop a Mental Models Representation Instrument on Newton's Laws (MeMoRI-NL). The ADDIE (Analyzing, Designing, Developing, Implementing and Evaluating) model was used as a research method. The sample consisted of 30 students of 15-16 years-old at one of senior high school in Tatar Pasundan. The data was examined using Rasch analysis on validity, reliability, level of difficulty, and distributions of students' mental models. Students' mental models were classified as Scientific (SC), Synthetic (SY), Synthetic almost Misconception (SYM), and Initial (IN) model. Based on the evaluating stage, students' mental models are mostly in the SYM and IN model. Consequently, it can be concluded that the Mental Models Representation Instrument on Newton's Laws (MeMoRI-NL) can be developed using the ADDIE model and most of the students' mental model has not been following scientific knowledge. Based on this research, teachers or educators should enhance students' mental models, especially for female students.

The study aims to investigate the evaluation model of professional leadership and the characteristics of successful principals at an Indonesian secondary school. It is to further realize the effective learning and to produce instruments that meet the validity and reliability tests. It also aims to discover the correlation and the significance of the independent variables on the dependent variables, and the percentage of influence on the indicators in shaping the model of principals' leadership. Quantitative data were obtained by distributing questionnaires to 100 students. The number of respondents was determined using a simple random sampling technique. The research findings showed that there was a significant correlation among the principals' leadership, characters, and effective learning. It indicated that leadership evaluation influenced the school leadership and the principals' characters on effective learning. The results of the measurement on formative relationships showed that the indicators of behaviour and actions of school principals who manage the teachers to conduct learning activity seriously in the classroom became a determining factor in shaping the effective learning paradigm in secondary schools.

The industrial revolution era 4.0 has now become a major topic in every country. Various sectors respond quickly to this problem, including education. In response to this, there are several aspects of skills that students must master. One of them is problem-solving skills. One of the aspects that influence the students' problem-solving skills is the context and problem-based learning model. The purpose of this study is to describe the effect of the model on students' skills to solve physics problems. The research method used is a quasi-experimental research design with non-equivalent control group design. The data analysis technique used Independent Sample T-Test by PASW 18 with a significance 5%. Based on the results of the Independent Sample TTest can be concluded that there is an effect on the model that was applied with a significant gain of 0,00. The results showed that the context and problem-based learning (C-PBL) model affected the physics problem-solving skills. The C-PBL model is able to improve the students' physics problem-solving skills, communication skills, the students' confidence in learning, as well as improving students' understanding of physics lessons conceptually.

The purpose of this research is to describe the effectiveness of STEM on the physics concepts understanding seen from gender differences. The research method used is a type of quasi-experimental design with 2 x 2 factorial design and saturated sampling technique. The data collecting technique used a tested method to see the results of students' concept understanding. Hypothesis testing was done using two-way ANOVA 2 x 2 factorial designs. The results of the study are: (1) there are differences in STEM and conventional learning on concepts understanding and the use of STEM learning is more effective than the conventional one; (2) there are differences in the results of understanding the concept between male and female students where male students are higher than female students; and, (3) there is no interaction between learning and gender towards concepts understanding. The research recommends designing the STEM-integrated ESciT learning to be relevant with the indicator measurements and to manage the learning effectively to obtain optimum learning outcome.