INTRODUCTION Philippines known as a multilingual country because of the multi-culture they had. In every group they have their own localities, it signifies as where they belong but there are certain localities where you could find the various groups which muslim-christian peolple living soothe together. In that case, there are certain schools that you could find the muslim-christian learners and most of it are in public schools. By the time of President Benigno Aquino, he implemented the k-12 program which included the implementation of MTB-MLE (Mother Tongue – Based Multilingual Education) short for mother tongue. MTB-MLE refers to the use of students’ mother tongue and two or more additional languages as Languages of Instruction (LoI) in school. According to the official language policy of the 1987 Educational Act, children in Grades 1 – 3 were to be instructed in their first language. Many studies have already revealed that teaching using the mother tongue in the early grades enhances children’s ability to learn better compared to the use of a second or foreign language (UNESCO, 2003; Skutnabb-Kangas, 2003 as cited by Rai, et al., 2011) Perhaps, we incognizant if there is a research conducted on the effectiveness of mother tongue that addresses to muslim learners studied in christian areas specifically in Kidapawan city who are in Grade 3 level. There were 10 pupils to participate:5 pupils from Suerte Memorial Elementary School, 5 pupils also from Pilot Elementary School. This study provides information of the hidden feelings of muslim learners about the language instruction that the teacher used which is not their first language, and how it affect to their academic performance in school. This study aimed to determine the effectiveness of mother tongue addressing to muslim learners in Kidapawan city. Specifically, it answered the following research questions: 1. What are the insights of muslim learners about the language instruction that the teacher used? 2. How it affect to their academic performance? 3. How did muslim learners cope up with this kind of system? Chapter 2 Review of Related Literature In this chapter, I have presented different Literatures. MT-Based MLE programs enable students from non-dominant language communities to build a strong educational foundation in the language they know best—their MT or first language (L1)—and a good bridge to the official language—the school L2—and other languages of learning (L3, L4, etc.) and then encourage them to use both / all their languages for life-long learning. ( Dep.Ed Order 16,s. 2012). The most powerful factor in predicting educational success for minority learners is the amount of formal schooling their received in their L1… Only those language minority students who had 5-6 years of strong cognitive and academic development in their L1—as well as through [L2]—did well in Grade 11 assessments (Thomas and Collier, 2001). “The choice of the language…is a recurrent challenge in the development of quality education... Speakers of mother tongues, which are not the same as the national…language, are often at a considerable disadvantage in the educational system…” (UNESCO, 2003). Children whose first language is not used at school … experience lower levels of learning and are much less likely to be able to contribute to a country’s economic and intellectual development (World Bank, 2006, page 4). UNESCO has encouraged mother tongue instruction in early childhood and primary education since 1953 (UNESCO, 1953). Yet, monolingualism in official or dominant languages is still the norm around the world (Arnold, Bartlett, Gowani, & Merali, 2006; Wolff & Ekkehard, 2000). In its report, ‗Strong Foundations: Early Childhood Care and Education‘, UNESCO (2007a) points out the overlooked advantages of multilingual education in the early years. When children are offered opportunities to learn in their mother tongue, they are more likely to enrol and succeed in school (Kosonen, 2005) and their parents are more likely to communicate with teachers and participate in their children‘s learning (Benson, 2002). Mother tongue based education especially benefits disadvantaged groups, including children from rural communities (Hovens, 2002) The United Nations Universal Declaration on Human Rights (1948) affirms the right to education without discrimination. Article 2 of this fundamental document establishes the basic principle against discrimination on the grounds of language. Article 5 of the 1960 Convention and Recommendation against Discrimination in Education specifically recognizes ―the right of the members of national minorities to carry on their own educational activities, including … the use or the teaching of their own language.‖ More recently, numerous other United Nations declarations and conventions affirm the rights of minorities, including Indigenous peoples, to learn and/or have instruction in L1 or their heritage language. Many studies show that mother tongue-based instruction can improve a child‘s self-esteem (Appel, 1988; Cummins, 1989, 1990; Hernàndez-Chavez, 1984). As Rubio (2007) points out, children perceive at an early age that languages are valued differently. When there is linguistic and cultural discontinuity between home and school, minority language children may perceive that language and culture are not valued—a perception that lowers their self-confidence and self-esteem and interferes with their learning (Baker & Prys Jones, 1998; Covington, 1989). UNESCO (2006, p. 159) suggests that the transition to a language of instruction other than the child‘s L1 should not be required of students before age 6 to 8 years. Other reports on mother tongue-based programs have concluded that children who learn in L1 for the first six to eight 26 years of formal schooling have better academic performance and self-esteem than those who receive instruction exclusively in the official language or those who transition too early from the home language to the official language. Chapter 3 Methodology It includes the research design, role of the teacher, research materials, data collection, data analysis, trustworthiness and credibility and ethical consideration. Research Design The researecher will be using the interview method to gather data about the effectiveness of mtbml-mle, wether the language has an effect of learning process of the pupils. This questioner will be used to determine if there is a big difference of the response of the selected participants. The questioner could lead to the ideas that would help to the development of the research. The researcher will also use set of questions interpreted in two different ways, the Maranao and maguindanao, language. Role of the Researcher Research materials Data Collection A semi-structured in-depth interview (Patton, 1990) was used as data gathering tool. Their answers revolved on the questions “ Data Analysis Trustworthiness of the study Ethical consideration