This document discusses mother tongue-based multilingual education (MTB-MLE). It defines key terms like mother tongue and outlines the principles and stages of an MTB-MLE program. MTB-MLE aims to produce learners who are multilingual, multicultural, and multilitterate by using the students' native language as the primary language of instruction and gradually introducing additional languages. Research shows that students who receive early education in their home language tend to perform better overall and that MTB-MLE programs can be more cost effective than systems that use only the secondary language.