Since the latter part of the 20th century, the introduction of the immersion programme as one of bilingual education and the research of its necessity in the Korean education system has been shown. J. Park (2000) suggests the importance of bilingual education, and especially the application of immersion education to English classes in Korea. His paper provides three key objectives; showing successful cases of other countries in terms of immersion education, exploring the applicability of the immersion scheme in Korean education and arguing that partial subjects need to be taught in the immersion education system. There is updated research based on teachers' cognition to apply immersion education in the Korean curriculum. S. Park (2004) broadly surveys the subject of teachers' ideas in relation to English immersion education in Korean elementary schools in the Seoul metropolitan area. He suggests several ideas based on his research findings and some representative suggestions from participants are summarised as follows (2004: 277-278): 'English immersion education should be fundamentally implemented after cultivating professional immersion teachers and should not give pressure on general subjects' teachers.' Teachers emphasise the need for government policies to give thoughtful consideration to immersion teachers in order to make them into immersion teachers. Additionally, preliminary arrangements in terms of curricula and materials would be needed to minimise the possibility of disorder and inconvenience caused by insufficient preparation. In relation to induction timing, they recommend slow and partial induction of immersion education and the government should suggest this policy to schools in the form of a voluntary, not compulsory, aspect in the beginning stage. The idea of working with English native speakers is recommended and desirable for team-teaching, but Korean teachers should lead the initiative. They recommend that in the later phase, Korean teachers who are fluent in English should lead the class alone. Especially, social equality between the students from diverse family backgrounds is insisted upon and policy-makers are required to suggest proper methods of selecting beneficiaries. Furthermore, teachers argue that the induction of immersion education should not foster the growth of the private education market.' Additionally, J. Park and S. Park (2007) suggest a time of induction of English immersion education, appropriate subjects of immersion, its curriculum, a selection scheme for students of this programme, immersion education teachers, types of immersion class, a plan for improving teachers' English proficiency, and developing materials in a practical manner.