Implementing mother-tongue based education in a multilingual context like the Philippines requires a full appreciation of the diversity of languages spoken across communities and schools and among students and their teachers. DepEd’s Learner Information System which assigns a language to students when they are registered fails to capture a true picture of the languages students speak, primarily because it relies on the teacher to select the language assigned to each student. For example, in Region V, most teachers simply assign “Bikol” to their students. The USAID-funded ABC+ project deployed a computerized language identification tool in region V and VI to more accurately assess students and teachers individually and thus identify the primary and secondary languages that they speak.