Content and Language Integrated Learning (CLIL) is an innovative teaching approach that promotes the simultaneous learning of a foreign language and subject content.1 In this study, the authors implemented CLIL lessons in Mongolia, using English or Japanese as the medium of instruction and science—mainly chemistry—as the subject content.2 These lessons were designed based on Classbooks of Hypothesis-Experiment Class (HEC). HEC was originally developed by Dr. Itakura in 1963 to teach fundamental and universal scientific concepts.3 Classbooks are unique textbooks for HEC and many Classbooks have been developed so far. HEC lessons progress through repeated cycles of Problem-Expectation-Discussion- Experiment, with experiments specifically structured to highlight the conflict between naive and scientific concepts. These are designed to help students recognize the validity and explanatory power of scientific concepts. Between 2018 and 2025, the authors conducted 14 CLIL lessons across eight visits to Mongolia. This presentation will introduce selected lesson topics, including: “What conducts electricity and what does not,” “Ions and food,” and “Focus on the weight of object (Combustion).” The lessons demonstrate a practical model for integrating science and language education in cross-cultural contexts.
