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This study describes the availability and utilization of Central Kalimantan folklore books in elementary school learning in Kahayan Tengah District, Pulang Pisau Regency. Folklore has potential as a contextual learning medium that strengthens students' character and cultural literacy. The research employed a descriptive qualitative approach with observation, in-depth interviews, and documentation in three randomly selected elementary schools: SDN Tuwung 1, SDN Tuwung 2, and SDN Bukit Rawi 1. The findings reveal that the availability of Central Kalimantan folklore books is uneven. SDN Tuwung 1 possesses several bilingual books from the Central Kalimantan Language Center. SDN Bukit Rawi 1 has only two anthology titles in fairly good physical condition. SDN Tuwung 2 has only one local folklore book. The utilization of folklore books in learning remains incidental and has not been systematically integrated into the curriculum. The most frequently used methods are read-aloud and oral storytelling. Follow-up activities such as rewriting or dramatization are rarely conducted. The main challenges include limited book collections, lack of curriculum integration, and minimal teacher training. Nevertheless, students' enthusiasm for folklore is considerably high, indicating significant opportunities to develop literacy programs based on Central Kalimantan folklore. This study recommends more equitable book collection provision, integration of folklore into learning modules, and teacher training to innovatively utilize folklore in the learning process.

This study examines the dominance of mother tongue use in junior high school environments and its implications for the use of Indonesian as the language of instruction. The research is grounded in the sociolinguistic reality of multilingual Indonesian society, where students tend to rely on their first language in daily communication. The objective of this study is to analyze the factors influencing the dominance of mother tongue, its impacts on students’ Indonesian language proficiency, and its pedagogical implications. This study employs a qualitative approach using a literature review design, analyzing relevant scholarly sources published in recent years. The findings indicate that the dominance of mother tongue is influenced by linguistic, social, and psychological factors, including family environment, peer interaction, and limited Indonesian vocabulary mastery. The study reveals dual impacts: while mother tongue use facilitates comprehension and increases students’ confidence, it also potentially hinders formal Indonesian language development and leads to language interference. The study concludes that mother tongue should not be viewed solely as a barrier but as a potential pedagogical resource. The implications suggest that educators should adopt contextual bilingual strategies to optimize Indonesian language learning in multilingual classrooms.

Indonesian Sign Language (Bahasa Isyarat Indonesia, BISINDO) is often misunderstood as merely a gestural or simplified form of communication, undermining its linguistic sophistication and contributing to barriers to deaf inclusion in Indonesia. Approximately 2.6 million deaf individuals in the country rely on BISINDO as their primary language. This study explores the linguistic complexity of BISINDO, documenting its phonological, morphological, syntactic, and semantic systems. Using a mixed-methods approach, we analyzed 150 hours of BISINDO conversations from 80 deaf signers, conducted experimental studies on phonological distinctions and syntactic complexity, and performed ethnographic fieldwork in deaf communities and schools. Comparative analysis with American Sign Language (ASL) was also conducted. Our findings demonstrate that BISINDO is a fully developed natural language, with 45 handshapes, 18 locations, 23 movements, and 4 orientations in its phonological system. It shows productive morphological processes, flexible word order, and rich semantics, including idioms and metaphors. However, there are significant barriers to inclusion: 68% of deaf students lack qualified BISINDO teachers, and 84% of public services lack sign language interpreters. Furthermore, 72% of hearing Indonesians still do not recognize BISINDO as a legitimate language. Deaf community organizations, however, report BISINDO as central to their identity. The study highlights the need for policy reforms, including BISINDO recognition as an official language, qualified interpreters, bilingual deaf education, and public awareness campaigns to combat misconceptions.    

This study investigates code-switching strategies between Indonesian and the Maumere local language in academic Indonesian language learning at the university level. In many higher education contexts, the dominance of standard Indonesian as the sole medium of instruction often creates cognitive, linguistic, and cultural distance for students who come from strong local language backgrounds. This qualitative study aims to describe the forms, pedagogical functions, and academic implications of Maumere–Indonesian code-switching in classroom interaction. Employing a case study design, data were collected through classroom observations, in-depth interviews with lecturers and students, and analysis of learning documents. The findings reveal that code-switching occurs systematically at the opening of lessons, during the explanation of abstract concepts, and in small-group discussions. The Maumere language functions as a cognitive and affective bridge that facilitates comprehension, increases student participation, and strengthens academic literacy. The study concludes that pedagogically controlled code-switching supports additive bilingualism and contributes positively to inclusive, contextual, and culturally responsive academic learning in multilingual higher education settings.

This systematic literature review examines the implementation of Content and Language Integrated Learning (CLIL) in Indonesian senior high schools. Following PRISMA guidelines, nine studies published between 2021 and 2025 were analyzed to identify the benefits and challenges of this approach. The findings reveal that CLIL effectively enhances student engagement, motivation, and the integrated development of subject knowledge and English proficiency. However, implementation is often hindered by limited teacher readiness, insufficient collaboration between subject and language teachers, and a lack of appropriate assessment methods. Analysis using the 4Cs Framework shows that while Content and Communication are prioritized, Cognition and Culture receive less explicit attention. The study implies that successful CLIL sustainability requires continuous professional development and stronger institutional support within the Merdeka Curriculum. These results provide a strategic basis for educators and policymakers to optimize bilingual instruction in Indonesia.

This study explores the integration of Indonesian and the Maumere local language in academic learning, particularly in the Indonesian Language course at Universitas Muhammadiyah Maumere. The research is grounded in concerns over the weakening of local linguistic identity within higher education and the dominance of monolingual academic practices that often marginalize students’ cultural backgrounds. The objective of this study is to analyze how the integration of local language and cultural texts can strengthen students’ literacy skills, linguistic competence, and local identity awareness. Employing a qualitative approach, data were collected through classroom observations, in-depth interviews with students and lecturers, and document analysis of learning materials and student assignments. The findings reveal that the use of Maumere language elements such as traditional narratives, expressions, and cultural concepts facilitates deeper comprehension, encourages critical literacy, and enhances students’ engagement in academic discourse. The integration strategy also supports students’ ability to bridge everyday language practices with formal academic Indonesian. This study implies that culturally responsive and bilingual oriented learning can serve as an effective pedagogical strategy in higher education, particularly in multilingual contexts, while simultaneously contributing to the preservation of local languages and the development of inclusive academic literacy.

Data was collected through the listening method with the recording technique, then analyzed using mixed code theory in sociolinguistic studies. Data was analyzed using mixed code theory in sociolinguistic studies to reveal language usage patterns in the context of digital media. The research results show that code mixing serves as a multidimensional communicative strategy. First, mixing code is used to express emotions more effectively and authentically. Second, it serves to clarify the meaning of psychological concepts that do not have the right equivalent in Indonesian. Third, build closeness with an audience that has a bilingual background. Fourth, constructing a bilingual identity of speakers that reflects the social reality of Indonesian urban society. This research contributes to the understanding of the language practice of the Indonesian bilingual community in the digital era, especially in the delivery of personal and sensitive issues such as mental health, which requires a flexible and relatable communication strategy for millennial audiences and generation Z.

This study reviews the implementation of Content and Language Learning (CLIL) in Indonesia senior high school through a systematic review. The review aim to identify research trends, report benefits, and key challenges of CLIL in Indonesia education context. Following the FRISMA guidelines, nine peer-reviewed studies published between 2021 and 2025 were selected from reputable academic databases. The analysis focuses in research design, learning outcomes, and implementation n issues, and it applies the CLIL 4Cs framework—Content, Communication, Cognition, and Culture—as the main analytical lens. The finding indicates that CLIL has appositive impact on student engagement, learning   motivation, and better understanding of content and increased confidence in using English in academic context. CLIL also support active learning and encourages higher-order thinking skills. However, the review reveal several challenges that limit effective implementation. These include limited teacher readiness, insufficient English proficiency among teachers and students, lack of collaboration between subject teachers and English teachers, nd difficulties is assessing content and language learning simultaneously. Analysis the 4Cs framework show that Content and Communication are the most emphasized componet in current CLIL practices, while Cognition receives moderate attention and culture is rarely adressed explicitly. The study concludes that although CLIL is feasible and beneficialfor Indonesia senior high schools, its long-term succes depend on continues teacher professiional development, stronger institutional support, and clearer integration within the Merdeka Curriculum. Theis review provide useful insights for educators, researcher, and policemakers to improve bilingual and CLIL-based instruction in Indonesia.

This sociolinguistic study examines patterns of regional language interference in formal Indonesian usage across bilingual areas of Indonesia. Through a mixed-methods approach, this research analyzes oral and written data from 240 participants across three strategic bilingual regions: Javanese-Indonesian, Sundanese-Indonesian, and Batak-Indonesian. Data were collected through structured interviews, ethnographic observations, and corpus analysis of formal documents. Quantitative analysis employed linguistic corpus software to identify frequency patterns and interference distribution, while qualitative analysis applied ethnography of communication approaches to understand social contexts and functions of interference in communicative interactions. Findings reveal systematic interference typologies that vary according to linguistic domains. Phonological interference demonstrates the highest resistance to formal register constraints (78% consistency), with Batak-Indonesian speakers showing the highest interference rates (85%), followed by Javanese-Indonesian (74%), and Sundanese-Indonesian (71%). Lexical interference occurs in 65% of samples with significant variation based on communication domains, where Sundanese-Indonesian shows the highest rates (72%). Morphological interference is found in 52% of cases, particularly in affixation and reduplication systems. Syntactic interference shows the highest sensitivity to situational formality, decreasing from 45% in semi-formal communication to 28% in strict formal contexts. Research implications indicate the need for reorienting language policy from corrective approaches toward recognizing interference productivity. Language policies should develop flexible standards that accommodate regional variations and promote positive attitudes toward multilingualism. In educational contexts, integration of contrastive approaches in Indonesian language learning is required, along with development of instructional materials sensitive to students' linguistic backgrounds, and teacher training on managing productive versus corrective interference.This research contributes to Indonesian sociolinguistics through providing comprehensive empirical databases, developing innovative theoretical frameworks, and replicable methodologies for language contact analysis. Findings confirm that regional language interference in formal Indonesian constitutes a productive phenomenon reflecting Indonesia's multilingual vitality. Approaches that recognize productive aspects of interference while optimizing formal communication effectiveness become key to developing language strategies responsive to contemporary multilingual Indonesian realities.