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Indonesian as a national language seeks to be internationalized through the teaching of BIPA, which requires subject matter that includes linguistic and cultural elements. Teaching often focuses on vocabulary and grammar, neglecting the important cultural context. Javanese culture, particularly the performing art of Reog Ponorogo, can be used as an effective medium of communication and teaching. Through this approach, BIPA teaching can be integrated with immersive cultural experiences, enhancing the understanding of Indonesian language and culture among foreign speakers. In this study, we aim to develop BIPA teaching materials by using local culture such as Reog Ponorogo. In qualitative research, the results emphasize meaning rather than generalization, data collection methods are triangulated, and data analysis is done inductively. The data used were sourced from various books, scientific journals, and the results of a survey of the needs of BIPA teaching materials for foreign speakers at Yale University. The integration of culture in teaching materials, such as the traditional art of Reog Ponorogo, not only enriches the learning experience, but also helps learners understand the social context and values underlying language use. Reog Ponorogo, with its deep symbolism and philosophy, provides an opportunity for learners to not only acquire language proficiency, but also develop Indonesian cultural values and character.

This study focuses on the analysis of language errors at the linguistic level. It employs a descriptive method to depict an existing and ongoing phenomenon to address the research problem. The process includes a literature review of several journal articles and other sources relevant to the analysis of language errors. Additionally, a video from the TikTok account Pegele, specifically a short video from the ADA Podcast, was used as the analysis material. The video analyzed at the linguistic level was transcribed into written form to facilitate the research process. The short video from the TikTok account Pegele was used as analysis material based on the subtitle textlines included in the video. The study identified several language errors at the linguistic level, including phoneme addition, phoneme reduction, phoneme substitution, affix addition, affix reduction, and affix substitution. These language errors can be attributed to several factors, such as the influence of the mother tongue, limited proficiency in Indonesian, and a lack of formal language instruction. Efforts to reduce linguistic errors in the speech acts performed by Arafah Rianti, Halda, and Derbi Romero in the ADA Podcast program include studying Indonesian sentence structures, expanding vocabulary, and practicing speaking more frequently.

Indonesian language plays a crucial role in daily life and education, particularly at the higher education level. As the medium of instruction, proficiency in Indonesian significantly impacts students' academic achievement, including those in Accounting programs. This study aims to analyze the influence of Indonesian language proficiency on the understanding of course materials and the academic achievement of Accounting students at the State University of Medan. Employing a qualitative phenomenological approach, this research involved 36 student respondents currently taking Indonesian language courses. The findings indicate that strong Indonesian language skills are essential in helping students comprehend accounting concepts, read textbooks, and complete assignments and exams. The majority of respondents agreed that good Indonesian language skills support their academic success, especially in explaining exam answers and writing reports. Conversely, limited Indonesian language proficiency hinders students' ability to grasp complex accounting concepts. This study concludes that strong Indonesian language proficiency contributes significantly to improving students' academic achievement in accounting and provides recommendations for developing Indonesian language instruction that is more integrated with technical courses in the Accounting department.

Slang is a rapidly growing linguistic phenomenon among Indonesian teenagers, especially in daily interactions and social media usage. This widespread use of slang is predicted to impact teenagers' formal language skills, particularly in the context of proper and correct Indonesian. This study aims to identify the influence of slang usage on formal language proficiency among teenagers. Using a qualitative approach, this research was conducted through observations and interviews with several students at the Perguruan Indonesia Raya Foundation in Bandung. The results indicate that excessive use of slang can decrease teenagers' formal language skills, particularly in writing and speaking. However, slang can also enrich linguistic variation among teenagers as a form of expression and social identity. Therefore, an appropriate educational strategy is needed to maintain a balance between slang and formal language usage among teenagers

The mental and physical health of students is greatly influenced by physical education, especially in the Physical Education, Health, and Recreation (PJKR) study program at Medan State University. One of the languages ​​that can be used in PJKR learning to understand the Theory and Practice of Education and to communicate with lecturers and friends during lectures is Indonesian. The purpose of this study was to determine the effect of Indonesian language proficiency on students' understanding of physical education theory and practice. This is because language is an important communication tool in learning, including in physical education lessons. The results of the study showed that increasing Indonesian language proficiency has an effect on contributing to improving student achievement in the field of Physics education. 

The research was carried out with the title "Analysis of Batak Language Code Mixing When Learning Indonesian in Class The use of code mixing is the Batak regional language. The aim of this research is to determine the main causes of the use of code mixing during learning. This research methodology is a qualitative descriptive method. Data was obtained from class X students of YAPIM Brand High School and the results of interviews from Indonesian language teachers. Data collection techniques were carried out by interviewing, recording and taking notes. The results of this research are forms of code mixing in teacher and student conversations in Indonesian language learning in class X SMA YAPIM Brand, namely: a. Use of Toba Batak language code mixing, b. There are 76 code-mixed data, the forms of code-mixing use are 13 code-mixes of word insertion, 17 phrase insertions, 46 clause insertions, word and sentence insertions. Factors causing code mixing are: a. Students' proficiency in speaking two languages, including the Toba Batak regional language and Indonesian, b. Social environment, c. Contextual situation. However, Indonesian language interference is not eliminated by the presence of the regional language, it's just that students sometimes focus more on using the regional language instead of being in context when speaking with fellow students.

This study delves into the usage of Indonesian language on the social media platform Instagram, with a particular focus on identifying and analyzing the prevalent errors and misunderstandings that arise. Employing a descriptive qualitative research methodology, the study examines user-generated comments and captions. The findings reveal that users frequently commit spelling mistakes on basic words, including capitalization, punctuation, and word separation. Additionally, inappropriate word choices and grammatical errors are common among users. Furthermore, the mixing of Indonesian with slang, English, and local dialects contributes to confusion and communication barriers. Overall, the study highlights the suboptimal usage of Indonesian on Instagram, emphasizing the need for enhanced language proficiency and effective communication strategies.