Proceeding SYMBION (Symposium on Biology Education) http://seminar.uad.ac.id/index.php/symbion 2540-752X (print) | 2528-5726 (online) 10.26555/symbion.11695 symbion@pbio.uad.ac.id Design of RBL-STEM learning model through analysis of chitosan making from crab shell waste in improving students' metacognition H.B.A Jayawardana 1 * ; Syifa Salsa Bella M.P 2 ; Zulfa Nur Hakiki 3 Biology Study Program, PGRI Argopuro Jember University (UNIPAR), Jember, Indonesia 1 hepta2011@gmail.com*; 2 sooahn35@gmail.com; 3 zulfanurhakiki50@gmail.com * Corresponding author ARTICLE INFO ABSTRACT Article history Submission Dec 10 th , 2022 Revision May 10 th , 2023 Accepted May 17 th , 2023 Metacognition skills are needed in the face of technological disruption and the current industrial revolution 4.0 era. Metacognition is the ability to control cognitive processes in one's learning and thinking activities so that they become more effective and efficient. Metacognition is generally related to the dimensions of a person's thinking which can be divided into two parts, namely the awareness he has about his thinking (self awareness of cognition) and the ability to use his awareness to regulate his thinking process (self-regulation of cognition). Metacognition can be achieved by fostering high-order thinking skills (HOTS). Therefore, a research- based learning (RBL) with STEM (Science, Technology, Engineering and Mathematics) approach is needed. This study aims to develop a learning design with the RBL model with a STEM approach through the analysis of making chitosan from crab shell waste in improving students' metacognition. The research method used is a narrative qualitative method, which develops the syntax of the RBL learning model with the STEM approach. The main result of the research is a learning activity framework in the form of a description containing learning activities that will be carried out in the classroom. Keyword RBL learning model STEM approach Metacognition Chitosan This is an open-access article under the CC-BY-SA license Introduction Metacognition is a person's ability to organize and control cognitive processes in learning and thinking so that they become more effective and efficient. Students' metacognition skills are needed in welcoming the era of industrial revolution 4.0 and technological disruption like today. By improving their metacognition skills, students are expected to be able to solve problems, have awareness of their thinking process, and control their way of thinking. Metacognition can be used by students to detect the extent of understanding a problem. In the context of learning, students can know how they can learn and know their abilities, so they can know what learning strategies are the most optimal for learning more effectively and