<![CDATA[Modern education faces significant challenges due to rapid technological advancements. Teachers are required to adapt their instructional methods—which often rely on monotonous and tedious approaches like printed textbooks and standard PowerPoint slides—a situation also observed at SMKN 22 Jakarta. Since this can diminish student interest in learning, the innovation of digital learning media has become essential. Furthermore, SMKN 22 Jakarta faces a shortage of reading materials, particularly regarding Occupational Health and Safety (K3) topics; this highlights the need for innovative, technology-based learning media, such as e-books. An e-book designed for the K3 curriculum can enhance student understanding and make learning more engaging, relevant to modern times, and less tedious. This study focuses on developing a Heyzine-based e-book using the Research and Development (R&D) method—specifically the 4D model—to present K3 content in a format that facilitates easy access to information. By considering student reactions to conventional learning media and the potential of digital e-books, this research aims to create a valid and practical learning resource tailored to the needs of students at SMKN 22 Jakarta, thereby optimizing the learning process. The resulting e-book achieved an average validity score of 96.7% (categorized as "highly valid") and an average practicality score of 88.3% (categorized as "highly practical"). Consequently, the developed e-book is highly valid and practical for supporting a learning process that avoids monoton and boredom.]]>
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