The purpose of this study is to describe the results of the Define stage in the development of STEM (Science, Technology, Engineering and Mathematics) -based learning devices to improve students' higher order thinking skills. The learning device development model used is the four D model (Define, Design, Develop, Disseminate). The Define stage is carried out to define and define learning requirements. The steps that have been taken at the Define stage are front end analysis, student analysis, task analysis, concept analysis, and formulation of learning objectives. The results of the research for needs analysis are a description of the competencies that students must have after taking physics lectures, the learning approach used is based on STEM, the profile of graduates to answer future challenges and demands. The results of research for student analysis are descriptions of student characteristics which include reasoning abilities, background knowledge, and levels of student cognitive development. The results of research for task analysis are in the form of module position maps. The results of the research for concept analysis are in the form of a concept map about oscillations. The results of the study for the formulation of learning objectives were a description of the competencies consisting of attitudes, knowledge and skills. The conclusion from this research is that the Define Stage has been completed so that the development stage of learning devices can be carried out to the next stage, namely the Design stage
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