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Understanding fraction concepts remains one of the biggest challenges in elementary mathematics education. Many students struggle with grasping fundamental fraction concepts, performing calculations, and applying them in problem-solving contexts. This study aims to analyze various factors contributing to students' difficulties in understanding fractions using a systematic approach Systematic Literature Review (SLR). Data were collected from relevant scholarly articles published between 2020 and 2025. The findings indicate that the primary difficulties students face in understanding fractions stem from a lack of conceptual comprehension, weak operational skills, and challenges in converting word problems into mathematical models. Additionally, low learning motivation and limited teaching method variations also contribute to students' struggles with fraction concepts.

This study explores the potential and challenges of the Treasury Single Account (TSA), which the cur-rent government of Nigeria has recently fully implemented to drive economic growth and development. The government aims to close gaps and plug leaks in government funds while ensuring a robust finan-cial management system to guarantee transparency and efficiency in the administration of public fi-nancial resources. The paper provides a conceptual understanding of TSA and discusses its anticipated benefits to Nigeria’s economy, particularly in the context of financial management and control. Key benefits include reducing the cost of government borrowing, ensuring optimal utilization of govern-ment financial resources, and consolidating various government accounts into one unified account. The study also examines the structure of the TSA system and its various accounts, including the TSA pri-mary account. In addition, the paper highlights the goals of the TSA, such as improving accountability and reducing corruption. After discussing the potential and challenges associated with implementing the TSA, the study concludes that political will, integrity, and commitment are crucial for overcoming these challenges. Successful implementation of the TSA system requires addressing identified obstacles to realize the anticipated benefits, which would significantly enhance the efficiency of financial man-agement in Nigeria.

The rapid development of information technology has brought significant changes, particularly in the area of cybercrime, such as electronic document forgery. This research explores the role of digital forensics and information technology in proving electronic document forgery crimes in Indonesia, using a normative legal research approach. The study employs both a statute approach and a conceptual approach to analyze the effectiveness of digital forensics in uncovering electronic crimes. The findings show that while digital forensics plays a crucial role in investigating electronic document forgery, there are several complex challenges in its implementation. One of the major obstacles is the limited number of certified digital forensic experts in Indonesia, with only 147 professionals qualified in this field. Additionally, the existing legal regulations have not kept pace with the rapid advancements in digital technology, which poses significant challenges to enforcement efforts. The study identifies various technical barriers, such as the complexity of forensic technologies, the volatile nature of digital evidence, and the ever-evolving techniques used by cybercriminals. These factors complicate the process of proving electronic crimes and pose difficulties for investigators. In response to these challenges, the research recommends strategic measures such as strengthening the capacity of forensic laboratories, harmonizing legal regulations with technological advancements, and improving the competency of human resources in both technological and legal fields. The study contributes to the development of a conceptual framework for cyber law enforcement, providing a comprehensive perspective on the challenges faced in proving electronic crimes in the digital age. The research aims to inform policymakers in crafting more effective and adaptive law enforcement strategies.

The training Writing Screenplays Using Fair Use with AI was conducted to enhance participants' understanding of the fair use concept and the application of artificial intelligence (AI) technology in screenplay writing. In the digital age, AI offers great potential in the creative industry, but its use must be accompanied by a proper understanding of ethics and law. This training aimed to introduce the principles of fair use and how to use AI software to improve creativity and efficiency in writing screenplays. The methods used included lectures, practical exercises, and evaluation of participants' work. A total of 16 participants were involved in the training, which covered topics on fair use, AI application in screenplay writing, and the challenges and obstacles encountered. The results showed an increase in participants' understanding of fair use, followed by their ability to use AI to produce more efficient and creative screenplays. However, some technical and conceptual challenges were still found, such as difficulties in using AI software and limited understanding of fair use limitations. In conclusion, this training successfully raised participants' awareness of ethics and legality in the use of technology in the creative industry, with recommendations for improving materials and technical support in the future

This research explores corporate criminal liability in the context of crimes committed within Indonesia's oil and gas sector. In the framework of modern criminal law, corporations are increasingly recognized as legal subjects that can bear criminal responsibility, particularly in cases related to economic crimes, environmental violations, and corruption. Given the oil and gas sector’s strategic significance and high economic value, it is especially vulnerable to legal violations committed by corporate entities. The research adopts a normative juridical method, utilizing statutory, conceptual, and case study approaches to analyze the current state of legal accountability mechanisms. The findings indicate that corporate criminal liability in the oil and gas sector is not explicitly regulated under Indonesia’s Oil and Gas Law, resulting in significant legal gaps that hinder effective enforcement. Although several laws—such as the Anti-Corruption Law, the Environmental Protection and Management Law, and Supreme Court Regulation (PERMA) No. 13 of 2016—provide a basis for prosecuting corporations, their specific application within the oil and gas sector remains limited. This limited application is attributed to several challenges, including technical difficulties in proving corporate guilt, limited investigative capacity and resources among law enforcement authorities, and the disproportionate influence and economic dominance of oil and gas corporations in regulatory and judicial processes. To address these challenges, the research emphasizes the urgent need for reformulating the legal framework governing corporate liability in the oil and gas industry. This includes incorporating explicit corporate criminal liability provisions into sector-specific laws, strengthening institutional enforcement capacity, and applying legal doctrines such as corporate culture theory and strict liability. These efforts aim to ensure that corporations in the oil and gas sector can be held accountable for criminal actions, promote legal certainty, and uphold environmental and economic justice in Indonesia.

Mathematical proof is an important aspect in real analysis courses but is often a challenge for students. This research aims to analyze the types of errors that students often make in mathematical proofs in real analysis courses. The research method uses library research to explore the background, objectives, methods, findings and implications of the problem. The results of the analysis show that logical errors, conceptual errors, notation and writing errors, and heuristic thinking errors are the most common. These findings imply the need to develop more effective learning strategies to help students overcome difficulties in mathematical proofs. By understanding the types of errors that frequently occur, instructors can design learning methods that better suit students' needs.

In the digitalization era, mobile payment applications are highly sought after to facilitate financial activities. PLN has innovated by introducing PLN Mobile, which simplifies online electricity bill payments. Despite offering many conveniences, some users feel there are shortcomings and difficulties with this app, potentially affecting its continued usage. This thesis aims to evaluate the factors influencing users' decisions to continue using the application, utilizing a conceptual model that combines Human-Computer Interaction (HCI) and Trust based on research by Kaewkitipong et al. (2022). This model includes seven variables: skill, system quality, information quality, task-technology fit, HCI, trust, and continuance intention. Testing uses the SEM-PLS technique and is processed with SmartPLS 4 using a sample of 384 respondents. The results indicate that HCI and trust significantly influence continuance intention, while system quality, information quality, and task-technology fit significantly influence HCI. These findings provide insights for improving and enhancing the PLN Mobile service to encourage its sustainable use.

Abstract.  The purpose of this research is to identify the difficulties experienced by students in understanding the concepts, principles, and procedures in problems related to the material of lines and angles. This research is a qualitative study with a descriptive method. The subjects of this study were students of class VIII-1 at SMP Negeri 29 Medan. Data collection techniques included tests, interviews, and documentation. All students of class VIII-1 took a test on the understanding of concepts, principles, and procedures. Afterward, the test results were analyzed and categorized into three groups: high, medium, and low ability. Subsequently, two students from each ability group were selected as interview subjects. The results of this research indicate that the most common conceptual difficulty experienced by students is classifying objects according to their concepts in determining the type of angle according to its measurement. The most common principle difficulty experienced by students is connecting mathematical concepts in solving problems in the material of the relationship between angles formed by two parallel lines intersected by a transversal line. Meanwhile, the procedural difficulty experienced by students is that all students still make mistakes in explaining, planning, and applying the correct steps or algorithms in mathematical problems, both in the material of the relationship between lines, determining angles, and the relationship between angles formed by two parallel lines intersected by a transversal.