This research aims to determine the influence of the Problem Based Learning Model on Students' Critical Thinking Ability on Ecosystem Material for Class X Students of State High School 2 Gowa. This type of research uses a quasi-experimental type of research or also called quasi-experiment with a "random pretest posttest control group" design model. There are two data collection techniques in this research, namely, test and non-test, then the data collected is analyzed using descriptive analysis and inferential test analysis. The research results show that the average critical thinking ability students in the experimental class who were taught using the Problem Based Learning learning model were in the very good category with an average score of 78.52 and students' critical thinking abilities, while in the control class who were taught using the lecture method were adequate with an average score 52.55. Inferential analysis in hypothesis testing shows significant results with a sig value of 0.000 > 0.05 so that there is an influence of the Problem Based Learning learning model on students' critical thinking abilities in ecosystem material. This is also reinforced by the results of observations regarding student activity increasing.

This research aims to determine the learning outcomes of class V students at Lonrong State Elementary School, Bajeng District, Gowa Regency in science learning after implementing the Card Sort Type Active Learning Model on Science Learning Results for Class V Students at Lonrong State Elementary School, Bajeng District, Gowa Regency. This research uses a pre-experimental quantitative research method involving one class as a focus class using a One Group Pretest-Posttest Design. The population in my research was class V students with a total of 20 students at Lonrong State Elementary School, Bajeng District, Gowa Regency. The sampling technique used was using only the experimental group without a control (comparison) group. The author took samples using total sampling techniques or saturated samples. So the sample size for this research is all fifth grade students at Lonrong State Elementary School, Bajeng District, Gowa Regency. The instruments used were student observation sheet instruments and science learning outcomes tests in the form of multiple choice questions to measure student learning outcomes with Pretest and Posttest. The results of the research show that the science learning outcomes of students in class V of Lonrong State Elementary School, Bajeng District, Gowa Regency, descriptive statistical analysis data revealed that after implementing the Card Sort Type Active Learning Model, the average score on the Pretest was 45, which is in the very low category with the number of students not 16 students completed, namely 80% and 4 students completed, namely 20%. Meanwhile, the average on the PostTest, namely 68.05, is in the medium category with the number of students who did not complete 4 people, namely 20% and 16 students who completed it, namely 80%. The average score on the PostTest is higher than the average score on the Pretest. Meanwhile, the average in the n-gain test was 0.41, which means it is in the medium category. So it can be concluded that the application of the Card Sort Type Active Learning Model to student learning outcomes in class V science learning at Lonrong State Elementary School, Bajeng District, Gowa Regency has increased.

This research aims to determine the influence of the Problem Based Learning model on the scientific literacy abilities of class IV students at SD Negeri 18 Kalukuang, Pangkep Regency. This research uses quantitative research methods using True-experimental. The population in this study were all class IV students, the sample with a total of 26 students. The sampling method in this research used a saturated sampling technique. The results of the research show that the average score obtained by students in the pre-test class IV 76.15 which was in the sufficient category and the average score obtained by students in the post-test score in Class IV was 88.08 which was in the category Good. The results show that the use of the Problem Based Learning model can improve the scientific literacy skills of class IV. The results of data analysis obtained a sig value. 0,000. It turns out that the sig value. 0.000 is smaller than the probability value of 0.05 or in other words the value 0.05 > 0.000. So it can be concluded that, there is an influence of the Problem Based Learning model on the scientific literacy abilities of class IV at SD Negeri 18 Kalukuang, Pangkep Regency.

The Influence of the POE (Predict-Observe-Explain) Learning Model on Science Learning Outcomes on Changes in the Properties of Objects for Class V Sdn 17 Binamu, Jeneponto Regency. Thesis. Department of Elementary School Teacher Education. Faculty of Teacher Training and Education. Muhammadiyah University of Makassar. Supervisor I Hilmi Hambali and Supervisor II A. Muafiah Nur.This research aims to determine the effect of the POE (Predict-Observe-Explain) learning model on learning outcomes in science material on changes in the properties of objects in class V. This research is a quantitative research using quasi-experimental research design with experimental methods in the form of pretest posttest group control design, with two groups, namely the control group and the experimental group.The data in this research were analyzed using descriptive statistical analysis techniques and inferential statistics. The results show that there is an influence of the POE (Predict-Observe-Explain) model in science subjects on science learning outcomes in material on changes in the properties of objects for class V SDN 17 Binamu, Jeneponto Regency. This can be seen in the average posttest score for the control class which only reached 66.74, while the average posttest score for the experimental class reached 82.83. Based on hypothesis testing using the independent sample t test, the tcount value = 6.279, while the ttable value = 2.015. Based on the results obtained because tcount > ttable (tcount = 6.279 > ttable = 2.015), thus Ho is rejected and H1 is accepted.