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This research was conducted to develop field guide of herbaceous plants insect pollinators in city and residential area in Medan City for entomology course. This book was developed according to Thiagarajan 4D (define, design, development, dissemination) model, minus dissemination steps. This book was validated according to quality of its content/materials, learning design and layout design. Validation result of content aspects (suitability, accuracy and strength, systematics of learning, book efficiency in learning and language feasibility) assessed by content expert had an average score of 83.59% (very good). Learning design aspects (content feasibility and display feasibility) validation result by expert had an average score of 88.73% (very good). Result of layout design aspects (book size, cover design, and content layout design) assessed by content expert had an average score of 79.72% (good). Several revisions were made until those final scores obtained and the book feasible to use.