<![CDATA[Mathematical proof is one of the most important things for students to master in the Mathematics Education Study Program. Mathematics cannot be learned without learning evidence and how to reconstruct that evidence. Even so, students still experience difficulties when they find problems proving mathematics in a number of courses they are programmed for, one of which is in the Complex Analysis course. Researchers pay special attention to this and develop assessment instruments based on a commognitive framework to improve students' mathematical proving abilities. The cognitive framework consists of 4 indicators: word use, visual mediators, narrative, and routine. The instruments prepared were used in classroom action research which was carried out in 2 cycles. The action research model used is the DDAER model (diagnosis, design, action and observation, evaluation, reflection). The class that was the subject of the research was class 2021 B of the Mathematics Education Study Program at the Universitas Sulawesi Barat which programmed the Complex Analysis course as many as 26 students. The results showed that there was an increase in students' mathematical proving abilities by using a commognitive framework-based assessment instrument. In cycle I, 39% of students got a minimum score of 70, while in cycle II, 73% of students got a minimum score of 70. Keywords: Assessment Instrument; Commognitive Framework; Mathematical Proof]]>
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