The purpose of this study was to create a learning trajectory that would encourage students to learn and aid in their compr ehension of geometric transformation content. the Tedhak Siten tradition serves as a foundation for this study and a source of knowledge. The method used was research and development by Gravemeijer & Cobb with three main activities: preliminary design, design experiment (pilot experiment and teaching experiment), and retrospective analysis. This research involved grade 9th students at SMP Negeri 6 Semarang who carried out learning activities using the RME approach. The learning trajectory using the context of the Tedhak Siten tradition in geometric transformation material consists of 6 activities, namely: 1) find the definition and properties of geometric transformation; 2) find the formulas and reflection results; 3) find formulas and translation results; 4) find formulas and rotation results; 5) find the formulas and dilation results; and 6) solving contextual problems related to geometric transformations. This article presents the preliminary design stage of the design research, providing a detailed explanation of the initial stage and preparing it for testing in the subsequent design experiment stage.

Topics
General procedures and instrumentation, Design of experiments, Students, Learning and learning models, Science education, Knowledge, Teaching
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