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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.

Application of the Problem Based Learning Model to Improve Student Learning Outcomes in Science Subjects in the Saenama VSDK Class for the 2023/2024 Academic Year. This researcher aims to improve student learning outcomes in science learning on Temperature and Heat material for class V SDK Saenama for the 2023/2024 Academic Year through the Problem Based Learning Model to Improve Student Learning Outcomes. This research is classroom action research. Which was carried out at SDK Saenama from 13 to 18 November 2023 with the research subjects being students in class V of SDK Saenama for the 2023/2024 academic year, consisting of 20 students. Data collection techniques were carried out using learning results and student observation sheets using the Problem Based Learning learning model as well as learning tools in the form of syllabi, lesson plans and worksheets. The research results show an increase in student learning outcomes. Student learning outcomes can improve from average. The results of the research carried out show an increase in each aspect that has been determined. In the first cycle the percentage of completeness was 25% in the not yet category and in the second cycle it increased to 95% in the very good category. From these results it can be concluded that the application of the Problem Based Learning model to improve student learning outcomes in science subjects in the VSDK Saenama class for the 2023/2024 academic year has increased.

This study aims to describe the learning conditions of Indonesian History applied at Madrasah Aliyah Bustanul Muta'allimim Blitar which uses the Problem Based Learning learning model. Problem Based Learning model learning directs the ability of students to play an active role in solving a problem in the process of learning activities, but in reality in learning in class 10 of Madrasah Aliyah Bustanul Muta'allimin there are still some students who still have difficulty in solving problems and there are also some students who are less active when the learning process takes place. The formulation of the problems in this study are: 1) How is the implementation of the Problem Based Learning learning model in grade 10 Indonesian History subjects? 2) How can the implementation of Problem Based Learning improve the quality of 10th grade Indonesian History learning? 3) What are the implications of the implementation of Problem Based Learning on student learning outcomes? The method used in this research is descriptive qualitative, as for the data sources used, namely through primary data by digging directly to the research location located at MA Bustanul Muta'allimin Blitar, with data collection techniques using interviews, observation, and documentation and checking data validity through source triangulation. . The results of this study are 1) Implementation of Problem Based Learning model learning in Indonesian History subjects in class 10 A, 10 B and 10 C there are three stages that are applied in the learning process, namely the preparation stage, the core activity stage, and the final stage or evaluation. 2)  Analysis of Whether the Problem Based Learning Method can Improve the Quality of Indonesian History Learning in grade 10. There are differences in the responses of students from the three classes for class 10 A, the response of students is still difficult in solving problems in the learning process and difficulty in presenting material when in front of the class and less active in learning in class, this is different from class 10 B and 10 C, students are easier in solving a problem and can present material and be active in learning activities in class. So from this it can be said that learning in the classroom has improved, but there must be more improvements from the Problem Based Learning model when learning activities take place in class. 3) Classroom student learning outcomes For student learning outcomes are influenced by factors within students, namely about the motivation of these students in participating in learning. Students from the three classes can be said to be class 10 A which is rather low compared to the other classes, because there are only male students, this can happen because in the application of Problem Based Learning model learning, these students do not pay attention to the teacher's direction, and are less serious in learning activities, so they do not understand the material being discussed together, in contrast to classes 10 B and 10 C which tend to be more easily organized by the teacher and pay attention when learning activities take place and are active in the process of ongoing learning activities.  

This research aims to determine the effect of the Problem Based Learning learning model on review text writing skills in class XII students at SMA Negeri 1 Pekanbaru and to find out how the Problem Based Learning learning model is applied to review text writing skills in class the type of research carried out in this research is a Quantitative Approach. The population in this study was all students in class. The data collection technique used in this research is the test and observation method. Data Analysis Techniques In this research the author uses quantitative descriptive. The research results in this study are the value of review text writing skills studied using the Problem Based Learning method, meaning that the average percentage of student scores is 85.00 ≥ 100% of the specified KKM, so it can be concluded that H1 is accepted and H0 is rejected and there is an influence on Value of review text writing skills for class XII students at SMA Negeri 1 Pekanbaru. The results of hypothesis testing use the t test, namely the Independent Sample T-Test via the SPSS program. shows that t count ≥ table, namely 128.567 > 2.036 with df = 32 at the 5% significance level is 2.036 so that H1 is accepted and Ho is rejected.

The Problem Based Learning learning model is a learning model that begins with giving problems to students where the problems given are everyday experiences or have been experienced by students. Then students solve the problems given to gain new knowledge. It is expected that students are able to learn knowledge related to these problems, as well as students have skills in solving problems. The purpose of this research is to increase student motivation in PAI subjects at Perlaungan Islamic High School. The research method used is descriptive qualitative. The data collection techniques used are in-depth interviews, observation and documentation. Data analysis was carried out through data reduction, data presentation and then drawing conclusions. The sources of data in this study are school principals, deputy heads of curricula, PAI teachers, and students. The results of the study show that: 1. Implementation of the Problem Based Learning learning model in PAI subjects at Perlaungan Islamic High School there are five stages, namely, student orientation to problems, organizing students to learn, guiding educators to search for data on a problem, developing and presenting the work , analyze and evaluate. 2. Student learning motivation, there are two learning motivations, namely, intrinsic motivation, intrinsic motivation there are three indicators namely, there is a desire and desire to succeed, there are encouragement and needs in learning, there are hopes and ideals, and extrinsic motivation, there are five extrinsic motivations indicators namely, there is appreciation in learning, there are interesting activities in learning, there is a conducive learning environment, teacher-student relationships, student-student relationships.    

This study aims to determine whether applying the Problem Based Learning model can improve the mathematical problem solving ability of students of class VIII-A SMP Negeri 1 Stabat on SPLDV. This research is a class action research conducted in two cycles. Each cycle consists of 2 meetings. The subjects in this study were students of class VIII-A SMP Negeri 1 Stabat totalling 30 students. The object of this research is the improvement of students' mathematical problem solving ability through the application of the Problem Based Learning learning model on SPLDV material at SMP Negeri 1 Stabat in the 2023/2024 school year. Based on the results of data analysis, the average initial test score was 47.11 with the number of students who reached mastery as many as 4 students (13.33%) and students who had not reached mastery as many as 26 students (86.67%). Then learning was carried out with the Problem Based Learning learning model in cycle I and there was an increase in the problem solving ability test with an average value of 63.44 with 19 students or as many as (63.33%). Then students who have not reached completeness are 11 students or as many as (36.67%). Then in cycle II there was an increase with the average value of the student problem solving ability test being 84.11, with a total completeness of 26 students or as many as (86.67%) and the number of students who had not reached completeness was 4 students or as many as (13.33%). The level of student completeness of the problem solving ability test given in cycle II reached the good category, therefore it can be said that learning has been achieved. Thus it can be said that the class has reached more than 85% of students who have been completed to solve problems. So it can be concluded that using the Problem Based Learning model can improve students' mathematical problem solving skills.