This study aims to analyze the phenomenon of code-mixing in the Balinese Language Student Worksheet (Lembar Kerja Siswa/LKS) for Grade VIII at SMP Bintang Persada Denpasar. The focus of this research includes the forms of code-mixing, the causal factors, and its functions in instructional materials. This study employs a descriptive qualitative approach, with data collected through documentation and content analysis of the LKS used in the learning process. The results indicate that code-mixing in the LKS appears in the form of words (basic words/kruna lingga, derived words/kruna tiron, and reduplicated words/kruna dwi lingga) and phrases, categorized into necessary and unnecessary loanwords. The factors causing code-mixing include internal linguistic factors, such as the limited vocabulary of the Balinese language, and external linguistic factors, such as language habits, the influence of Indonesian, and curriculum demands. Furthermore, code-mixing serves several functions in learning, namely ideational, imaginative, informative, poetic, and metalinguistic functions. Although code-mixing can facilitate students’ understanding of the material, its uncontrolled use may reduce the purity of the Balinese language. Therefore, efforts are needed to optimize the use of Balinese in instructional materials while maintaining communicative effectiveness without neglecting linguistic norms
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