Development of a Learning Packet on Heat Transfer as Supplementary Materials

Abstract

Heat transfer is one of the most challenging topics for Grade 7 students due to its abstract nature and persistent misconceptions about conduction, convection, and radiation. These difficulties are often exacerbated by limited instructional resources, lecture-based teaching, and the lack of contextualized materials that support visualization and active learning. This study aimed to develop and validate a printed learning packet on heat transfer as supplementary material to support instruction in Grade 7 science. Using a developmental research design guided by the 4D Model (Define, Design, Develop, and Disseminate), the study began with a needs assessment involving five in-service junior high school science teachers to identify instructional gaps, learning challenges, and material requirements. Findings indicated learner misconceptions, difficulty distinguishing the modes of heat transfer, and limited opportunities for hands-on activities due to resource constraints. Guided by these findings, a printed learning packet incorporating simplified explanations, structured activities, illustrations, and real-life applications was developed and evaluated by five validators composed of in-service science teachers and science education specialists using a standardized rubric. The evaluation yielded a grand weighted mean of 2.85, interpreted as Very Highly Valid, with all criteria rated as Very Highly Acceptable. These results indicate that the developed learning packet is a pedagogically sound and contextually appropriate supplementary material for Grade 7 science instruction. Future studies may implement the packet in classroom settings and examine its effectiveness through pre-test and post-test designs and learner feedback.