摘要：This research aims to improve the students’ argumentation skills in X MIA 1 SMA Batik 2 Surakarta Academic Year 2014/2015 through the problem based learning implementation. This research uses a classroom action research which consists of three cycles. Each cycle contains of planning, acting, observing and reflecting. The subjects of this research are the students in X MIA 1 SMA Batik 2 Surakarta Academic Year 2014/2015 amounts to 33 students. The data are collected from test, interview, and documentation. The data validation uses triangulation technic. The data using descriptive analysis was based on three components, they are: data reduction, data presentation and drawing the conclusion or verification. The research procedure is using spiral method. The results show that the students’ argumentation skills are increase from pre cycle, cycle I, cycle II, and cycle III. The average of the students’ argumentation skills are increase from 28,96% to 50,06%. Claim aspect increase from 61,62% to 82,49%; evidence aspect increase from 15,66% to 37,37%; and reasoning aspect increase from 9,60% to 30,30%. Based on the research result, the conclusion are the argumentation skills improvement through problem based learning implementation in X MIA 1 SMA Batik 2 Surakarta.
关键词：action research class; argumentation skills; problem based learning
