<![CDATA[Based on the results of observations, the learning process still uses conventional methods and the textbooks used in the lecture process have not been able to lead to finding a concept. The aim of the study was to design a guided discovery-based module in the transformation geometry course at STKIP PGRI West Sumatra. This type of research is development research using the Plomp model which consists of 3 phases, namely preliminary research, prototyping phase, and assessment phase (Plomp, 2013: 19). The preliminary research stage consists of interviews with students and teachers, syllabus analysis, and textbook analysis. The prototyping phase is designing systematics and module structures, developing prototypes, and expert reviews. The results obtained at the preliminary research stage were based on interviews with lecturers and students who did not understand the basic concepts of geometry and were less able to prove the proposition. In the analysis of the syllabus and literature that was carried out was that the material taught was in accordance with the syllabus. The results of the module validity from the experts show that the guided discovery-based module is quite valid in the category.]]>
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