This document provides guidelines for developing contextualized instructional materials across K-12 curricula. It defines key terms like contextualization, indigenization, and localization. It also classifies different types of instructional materials like printed and non-printed resources. Guidelines are provided for developing learning activity sheets, including ensuring materials are self-explanatory, based on learning targets, and use clear fonts and illustrations appropriate for different grade levels. The overall goal is to develop materials that make the curriculum relevant and meaningful for learners.