<![CDATA[This research aims to develop teaching materials in the form of pocket books based on local potential in Dairi Regency which are used to improve the learning outcomes of high school class X students in ecosystem materials. This research uses research and development methods with a 4D development model which includes the define, design, develop, and disseminate stages. The research subjects consisted of 36 students of class X, one biology teacher, one lecturer of material experts, one lecturer of learning experts, and one lecturer of design experts. The data collection techniques used include observation, interviews, questionnaires, and tests. Data analysis was carried out using the Likert scale and the N-Gain test. The validation results showed that the pocket book obtained a feasibility percentage of 82.6% from material experts, 96.1% from learning experts, and 94.6% from design experts, all of which fall into the very feasible category. Educators' responses to pocket books showed a percentage of 96.1% with very feasible criteria, while students' responses in a limited group trial obtained a percentage of 91.6% with very feasible criteria. The results of the effectiveness test showed an N-Gain value of 0.77 in the high category. Thus, the pocket book based on local potential in Dairi Regency was declared effective in improving students' learning outcomes on ecosystem materials.]]>
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