Localization and contextualization are important principles in curriculum development and implementation. Localization refers to relating learning content to local information and materials from the learner's community. Contextualization is the process of relating curriculum competencies to a particular setting or situation to make them relevant and meaningful. Both localization and contextualization are mandated by the Philippine constitution and laws like the Enhanced Basic Education Act to foster preservation of culture and regional diversity. The REACT strategy provides a framework for contextual learning through experiences, applying concepts, cooperation, transferring knowledge, and self-directed learning. Teachers should maximize locally available materials and authentic activities from students' lives and interests to effectively localize and contextualize the curriculum.