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Problem-solving ability is an essential skill that students need to meet the demands of both academic learning and the workforce in the 21st century. This study aims to analyze the influence of self-efficacy and interpersonal communication on the problem-solving ability of eleventh-grade students at SMKN 31 Jakarta, both partially and simultaneously. A quantitative approach was employed, with data collected through a Likert scale questionnaire. Samples were drawn using a probability sampling technique with a proportional random sampling approach. Data analysis was conducted using Structural Equation Modeling (SEM) based on Partial Least Squares (SmartPLS 4.0). The results indicate that self-efficacy has a positive and significant effect on problem-solving, with a path coefficient of 0.455, a t-statistic of 7.843, and a p-value of 0.000. Similarly, interpersonal communication has a positive and significant effect on problem-solving, with a path coefficient of 0.447, a t-statistic of 7.501, and a p-value of 0.000. Taken together, self-efficacy and interpersonal communication account for the variance in problem-solving with an R-square value of 0.416, indicating that both independent variables explain 41.6% of the variation in problem-solving ability. These findings suggest that self-efficacy and interpersonal communication play a significant role in enhancing students' problem-solving ability.

This research aims to see the effect of the project based learning model on the ability to understand concepts in fraction material in fourth grade elementary school. This type of research is a quantitative approach and uses a quasi-experiment method. The design in this study was a nonequivalent control group design, namely using two classes, namely class IVB as the experimental class and IVA as the control class which was obtained randomly. The experimental class will be given PjBL learning model treatment and the control class will receive conventional treatment. This study gave a pre-test to both classes before giving treatment to both classes and gave a post-test to the class after receiving treatment. Based on the results of the hypothesis test data analysis that the researchers carried out, significant independent t-test results obtained for the initial and final values ​​of the experimental class and control class were 0.027. Based on these results, a significant value of 0.027 <0.05 was obtained, so Ha was accepted and Ho was rejected. Thus, it can be concluded that there is an influence of the project based learning model on the ability to understand concepts in fraction material in class IV elementary school.