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            The decree that regulates International Standard School is mentioned in the Education Bill No. 20 year 2003 about National System of Education in article 50 verse 3, “Indonesian government and or state government administers at least one education unit at any grade to be improved as an education unit with international standard.”

In the curriculum of the International Standard School in Indonesia, it is stated that English is used as the medium of instruction in teaching English, mathematics, science and technology, and it is used to communicate outside the class (Depdiknas, 2007). From the statement, it can be concluded that the International Standard Schools in Indonesia apply immersion as the method of using English as the medium of instruction. Burton (2001:125) described the same condition that happened in a private school in Japan. The school used an early partial immersion program-an intensive form of content based foreign language education, with some modifications that aims to develop proficiency in Japanese and English among native Japanese-speaking students. The chief characteristic of immersion education is the integration of academic curriculum content and foreign language instruction.

Burton (2001:1) defined bilingual education as an education involving two languages as a media of instruction; for instance, in the United States the instruction occurs in the majority language such as English and in a minority language, such as Spanish or Chinese.
    Bilingual education as stated in www.wikipedia.com can be categorized into several types: transitional bilingual education, two-way or dual language bilingual education, and late-exit or developmental bilingual education.

    Wiki (2007) stated that medium of instruction means the language used by teacher to teach. It may or may not be the official language of the territory (e.g. Bahasa Indonesia in Indonesia or English in Indonesia). English has assumed its place as the language of communication in the new linguistic global order. English is used in science, business, technology, and other domains. Nowadays, English is being applied in the curriculum as a medium of instruction in wide variety countries, from pre-school to higher education.