Mother-Tongue-Based Multilingual Education (MTB MLE) has become an important concept in the field of primary education in many parts of the world. MTB MLE is a form of education that deals with the bridging of learning in the mother tongue to using one or more languages as languages of instruction in schools. This study took place in the Southern Nation and Nationality Peoples Regional State of Ethiopia (SNNPRS) to investigate the implementation challenges faced by two sample minority languages, namely Dawuro and Kontaatho, that use the mother tongue as both medium of instruction and as a subject in primary schools. The study focused on the drawbacks that hindered the proper implementation of the education and training policy regarding mother-tongue education in minority language areas. To conduct the study, the qualitative research method was employed. Representatives from the Ministry of Education, Colleges of Teacher Education, primary school directors and teachers of mother tongue as a subject and as a medium of instruction, parents and relevant community representatives took part. From the Ministry of Education, two experts from the Curriculum Design and Implementation Directorate and two participants from Mother tongue and English Language development directorate were purposively invited to participate in individual interviews. Similarly, three instructors from one of the Colleges of Teacher Education and 32 mother-tongue teachers drawn from eight schools of the target area were also individually interviewed. In addition, three heterogenous focus group discussions were conducted with stakeholders comprising community and parents’ representatives, schoolteachers’ representative, students’ representatives and school directors. The study was based on the social constructivist and Vygotsky’s Zone of Proximal Development theoretical assumptions. The findings of the study indicated that MTB MLE is not being successfully implemented in the minority language areas in the SNNPRS because of the deficits in awareness raising, proper teacher training, readiness of the languages in relation to orthography and scientific terminology to be used as medium of instruction, availability and quality of teaching and learning materials, standardised orthography, availability of guidelines and a strategy to carry out the MTB MLE programme, support and follow up of the implementation of the MTB MLE programme. / Curriculum and Instructional Studies / Ph. D. (Curriculum and Instructional Studies)