The purpose of this study is to determine the opinions of classroomteachers in the elementary school about the use of the argumentationmethod appropriate to the Toulmin argumentation model in the scienceclass. This study was carried out in 16 hours (8 days) with participationof 37 class teachers in Balıkesir province of Bandırma. This study isbased on the case study of the qualitative research design. The data wasthe result of video recording of semi-structured interviews and semistructured interviews with six classroom teachers. The obtained datawas analyzed according to the content analysis which is one of theanalysis methods. At the end of this training, their experiences areexpressed as opinions. According to these views, the method ofargumentation; the students will be interested and attentive, thestudents will have a positive attitude towards the classes, the studentswill be actively involved in the lessons and learn meaningfully, theability to develop scientific thinking skills and to understand the natureof science can be used not only in science class but also in other courses.