<![CDATA[Indonesia's SDGs Roadmap 2030 underlines the importance of improving critical thinking skills to achieve sustainable development goals. Students still experience difficulties in developing critical thinking in biology learning. Conventional models are often considered less effective while complex problem-based learning models can be cognitively burdensome for novice learners. Another factor contributing to this problem is the lack of opportunities for students to apply their knowledge in real situations and solve complex problems. This research aims to develop and test the effectiveness of the ReCLif model as a simple and more effective alternative to problem-based learning for beginner learners. The ReCLif model is designed to provide challenges appropriate to the cognitive level of novice learners. This research uses research and development methods from Plomp and Nieveen as well as an experimental design to compare the ReCLif model with a control group. The research results show that the development of the ReCLif model learning syntax is an integration of complex thinking teaching and learning strategies with 3C3R design problems and 4C/ID instructional design with three learning stages (1) exploring real life; (2) using complex thinking skills; and (3) creating solutions for life situations. The results of the quade rank analysis of covariance test, obtained a Sig value. (0.000) <0.05 (?), then H0 is rejected and the research hypothesis is accepted. This means that there are significant differences in critical thinking skills in students between classes given learning using the ReCLif model, CTL model and TPS model. The results of the Bonferroni Dunn test show that the corrected mean value for the ReCLif model is 80.46, the TPS model is 71.27 and the CTL model is 70.57. It can be concluded that there is a significant difference in the mean value of critical thinking skills between the ReCLif learning model and the CTL and TPS models.]]>
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