<![CDATA[The purpose of this research is to develop open problem-based teaching materials in quality calculus learning (valid, practical, and effective). The specific target to be achieved is the availability of open problem-based calculus teaching materials in theform of: Lecture Program Unit (SAP), Student Worksheet (LKM), Student Handbook (BPM), and Calculus Ability Test (TKK). To achieve this target, the development process uses the 4-D Model (four D Models) from Thiagarajan (1974) which consists of four stages, namely: (1) the definition stage, (2) the design stage, (3 ) the development stage (develop), and (4) the dissemination stage (disseminate). To assess the quality of open problem-based calculus teaching materials developed, Nieveen's criteria are used, which meet the criteria of validity, practicality, and effectiveness. For the purposes of quality testing, the teaching materials were tested on students of the Mathematics Department, FMIPA UNM Makassar. The results showed that: (1) open problem-based teaching materials had met the validity criteria, (2) trial results showed: (a) open problem-based teaching materials had met the practicality criteria, (b) open problem-based teaching materials had met the effectiveness criteria.]]>
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