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Students tend to be passive in learning activities if the media is less supportive. Module development as a learning medium can overcome the passivity of students. The purpose of this research was to determine the validity and feasibility of the guided inquiry-based module on Human Digestive System materials to improve students' argumentation skill. This research is Research and Development. The research was conducted at class VIII of state junior high school 3 Surakarta. The module comprised of into three parts, namely the introduction, content, and closing. The contents section consisted of three sub-materials, namely: 1) food substances; 2) food digestion organs and processes; and 3) food digestive system disorders. The module feasibility was tested through the assessments of media, subject matter, learning experts and linguists. The results of experts’ evaluation toward the module showed that the module was feasible with the percentages were 88.28% (media design), 90.125% (material), 91.15% (learning aspect), and 94.8% (language). Therefore, the module is feasible to be used as a learning medium to improve students' argumentation skill.

The purpose of this study is to change argumentative skill on XI-class students in SMA through implementing a learning design of the respiratory system based on guided inquiry learning combined with assessment for learning. This research is a classroom action research conducted in three cycles from February to April 2016. Each cycle consists of four stages, namely planning, action, observation, and reflection. The subjects were 31 students of class XI SMA in the academic year of 2015/2016. The research data were obtained through essay tests, observation sheets, and interviews. The main data about the argumentative skill was measured by indicators: claim, reasoning and evidence measured by using argumentative-skill test in the form of questions proposed by the researcher in accordance the adequacy of each indicator. The technique of analyzing data was descriptive analysis while the data validation was triangulation technique. The research procedure used Mc.Taggart Kemmi's spiral research method. The results show that the application of the learning design of the respiratory system based on inquiry learning combined with assessment for learning is able to change the arguing ability of XI-class students in SMA. The pre-cycle result of the students' arguing ability constitutes 42.9%, in the claim aspect, 32.9% in the reasoning aspect, and 20,32% in the evidence aspect. The first cycle constitutes 80.64% in the claim aspect, 64.51% in the reasoning aspect, and 45.16% in the evidence aspect. Cycle II constitutes 100% in claim aspect, 77.41% in the reasoning aspect, and 70.96% in the evidence aspect. Lastly, cycle III constitutes 100% in the claim aspect, 90.32% in the reasoning aspect, and 87.09% in the evidence aspect..