<![CDATA[This research was instigated with Guided Discovery Learning based e-module learning medium that was not yet available to assist teachers in explaining learning material. This research aimed at producing a learning medium, finding out validity and practicality levels of Guided Discovery Learning based chemistry e-module developed on Atomic Structure lesson. It was Research and Development (R&D) with Design & Development (DDR) model. The subjects of this research were 10 the eleventh-grade students of class 1 at Senior High School of Muhammadiyah 1 Pekanbaru, 2 Chemistry subject teachers, a media expert lecturer, and a material expert lecturer. Questionnaire and interview were the techniques of collecting data. The research findings showed Guided Discovery Learning based e-module on Atomic Structure lesson that the validity percentages obtained from media and material experts respectively were 87.5% and 98.5% with very valid criteria. The percentage of teacher practicality test was 82.5% with very practical criteria, and the result of student response test was 82.7% with very good criteria]]>
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