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This study aims to (1) find out how to develop learning devices using the Discovery Learning model with a scientific approach to sequence and sequence material, (2) produce learning devices using the Discovery Learning model with a scientific approach to valid, practical sequence and sequence material effective. Research methods The development model that will be used to develop learning devices in this study is a modification of the Thiagarajan model known as Four-D Models (4D Model) namely defining, designing, developing, and dissemination. The researcher modifies the development model by simplifying the model, which is limited to the development stage by considering the limited time and cost. The results of this study state that the product developed meets the criteria of valid, practical and effective. Learning devices with an average score of 3.56 with valid criteria. The results of practicality of learning devices are obtained from the average results of the ability of teachers to manage learning, which is 3.46 which is categorized as well located in intervals of 3 ≤ P <4 and student response questionnaires that are above 80% positive responses of students. The effectiveness of learning devices is obtained from the analysis of student activities that are categorized as good as well as evaluating student learning outcomes that show the value of student mastery over 70.