<![CDATA[The purpose of this research is to develop thematic’s supplementary book for the fourth grade with a focus on the study of alternative energy and natural resources material. Thematic’s supplementary book was developed based on student characteristics and contextual. The materials were validated in terms of content, language, and design, the materials were tried out to three elementary students in one-to-one evaluation, six elementary students in small-group evaluations, and to twenty nine elementary students in field trial evaluation. The trial results demonstrate the feasibility of teaching materials have a high level. The average validity got 87.90, the practicality 85.76, and the effectiveness 91.95. So it is recomended be implemented as a supporting source in the learning activities, especially in studying alternative energy & natural resources.]]>
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