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Abstract

The purpose of this study is to describe students' mental models in phenomenon-based Argument Driven Inquiry (ADI) learning with formative assessment. This research uses quantitative and qualitative approaches with mixed methods of embedded experimental model design. The subject was taken from X IPA-1 with 26 students at Pademawu 1 Public High School. The instrument was developed in the form of 6 essay questions. Research data were analyzed using t-paired test, N-gain, and effect size. The results are categorized as surface, matching, and deep type of mental models. It is found that the phenomenon-based ADI accompanied formative assessment affect significantly on the mental models of students with an effect size of 1.86. It is also reveald that the improvement of students' mental models is low category with an N-gain of 0.2.

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