Less varied learning methods make learning activities boring. Emphasis on mastery of concepts and teacher dominance make students’ activities passive. The correct methods are needed to achieve the learning objectives. This study aims to evaluate the practicality of natural science learning devices for junior high school on the concept of environmental pollution using a problem-solving learning model. The research method uses Design Development Research by Tessmer. The data was taken at the small group evaluation and field test. Data were collected through observation of teacher and student activities with a scale of 1-4; self-assessment with a score of 1 (positive) and 0 (negative); and student response questionnaires on a scale of 1-5. The data were categorized and analysed descriptively. The results of the small group evaluation are: teacher activities get a good category; student activities with good categories in the preliminary and closing activities, but main activities are still quite good; self-assessment aspects show eight positive and two negatives, and student responses show nine positive and one negative. The field test results are: teacher and student activities get a “very good” category; self-assessment aspects show eight positive and two negative, and student responses are positive for all aspects.

The increasingly complex development era provides demands to the world of education in order to produce competent Human Resources in various competencies, especially the potential for critical thinking. The 21 st century education process is not just an educational process to make children know and understand a certain amount of knowledge. 21 st century learning includes critical thinking skills, creative thinking skills, communication and collaboration. Critical thinking skills are high level thinking skills logically and critically using deep reasoning to consider emerging ideas. The method used in this research is descriptive research method. The level of mastery of students' critical thinking skills is obtained by dividing the scores obtained by students with a maximum score multiplied by one hundred percent. Based on the results of data analysis and discussion it can be concluded that the critical thinking skills of SMPN 1 Piani students are still relatively low.

This study aims to evaluate the validity, practicality and effectiveness of learning tools using Blended Learning models to improve Self Regulation of student learning on hydrocarbons and petroleum materials. The development model used is the Tessmer Design which consists of stages 1) self evaluation, 2) expert opinions (3), 3) individual test, 4) small group test (small group) evaluation), and 5) Field test. The validation of learning tools, media, and self regulation questionnaires were each carried out by 3 expert validators. Research subjects in the one to one test amounted to 3 students aimed at analyzing the readability of teaching materials and LKPD, research subjects in small class tests totaling 12 people aimed at measuring the practicality and effectiveness of the learning device expectations. Research subjects in the field test totaled 36 students of class X A Multimedia SMK Negeri 3 Banjarmasin aimed at measuring the practicality and actual effectiveness of the learning device prototype. The results showed that the learning tools developed had a very valid category based on expert judgment, were very practical based on the feasibility of learning in class and student responses, and were very effective based on students' mastery learning with an N-gain of 0.36 of the moderate improvement category. Based on the results of research and development shows that the learning device developed is suitable for use in learning hydrocarbon and petroleum materials.

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