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This study aims to determine the factors that may affect in constructing the contextualized learning activity sheets based on the learners’ results and the teachers’ self-assessment using a descriptive correlation research design. The study's findings revealed that the teachers have varied levels of competence in terms of cultural knowledge; on average, they were at the Proficient level of competency. In addition, teachers’ self-assessments indicated that they strongly practiced the criteria in constructing contextualized IPED LAS. However, still at the Advanced Beginner level based on the learners’ results. It can be concluded that teachers are competent in handling IPED based on their profile and cultural knowledge, yet Advance Beginners in assessment skills. Teachers with higher educational qualifications improved their assessment skills. It is recommended that the regional and division IPED specialist should conduct quarterly training for teachers on the Indigenous Knowledge System and Practices (IKSP) and other IPED-related topics. Teachers may conduct indigenization mapping as part of the pedagogical strategy of handling IPED to encourage localization and indigenization of content. With the findings and results, the project ETASIP is made to aid teachers in planning for their assessment strategies.