In the Philippines, the concept of first language (L1) literacy—often referred to as Mother Tongue literacy—is built on the principle that a child learns to read, think, and express themselves best in the language they speak at home.

In Philippine schools, this concept was institutionalized through the Department of Education’s Mother Tongue-Based Multilingual Education (MTB-MLE) policy, which mandates using local languages (like Tagalog, Cebuano, Ilokano, Hiligaynon, or Waray) as both a subject and the medium of instruction from Kindergarten to Grade 3 (Garinto & Valdez, 2019; Medilo, 2016).

Core Theoretical Foundation: The "Linguistic Bridge"

First language literacy relies heavily on Jim Cummins’ Linguistic Interdependence Hypothesis. This theory states that skills learned in a child’s L1 (like decoding letters, identifying main ideas, and critical thinking) do not disappear when they learn a new language. Instead, these skills naturally transfer to a second (L2) or third (L3) language, such as Filipino or English (Garinto & Valdez, 2019). Essentially, a strong foundation in the mother tongue acts as a psychological and cognitive "bridge" to global languages.

The Reality in the Philippine

Recent scholarly investigations highlight both the powerful benefits and the systemic challenges of implementing L1 literacy in the country:

Boosts Confidence and Math/Science Comprehension: Local studies confirm that when younger students use their first language, they skip the exhausting process of translating words in their heads. They can think faster, participate without fear of making mistakes, and score higher in abstract concepts like word problems in Math and Science (Altaribba, 2022, as cited in IJMRA, 2025; DepEd, 2016).
The Literacy Transfer is Real: Research on multilingual Filipino children (e.g., Kapampangan-Filipino-English speakers) demonstrates that phonological awareness—the core mechanism of literacy—gained in the L1 directly supports the development of reading fluency in Filipino and English (Laurier Scholars Commons, 2021).
Systemic Bottlenecks: Despite its proven cognitive benefits, scholars point out that L1 literacy in public schools suffers from severe implementation gaps. Teachers face an extreme shortage of localized reading materials, confusing official translations of technical terms, and a prevailing societal bias where parents still erroneously equate intelligence strictly with early English fluency (Medilo, 2016).

CONCEPT OF LITERACY: FIRST LANGUAGE