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The researcher used the structure interview which the researcher written some questions that must be answered for the students. In this research, the interview was used to know the effectiveness using the strategy in the classroom by the teacher and also to know the students’ responses of using world café strategy through some question. Interview is a way in collecting the qualitative data (Sukidin et al, 2002). The result of this observation checklist and field notes was used by the researcher to revise in the next cycle. Sorabel M.Pd as the research collaborator in this research helped the researcher fulfill the observation checklist & field notes. This scale can be used to know the clear answer. Riduwan (2004:90) stated that Guttman scale is a cumulative scale which only has two answers, yes or no. The researcher used Guttman scale in the teacher and students’ observation sheet. While, the students’ observation checklist & field notes also consist of questions items which used to identify and collect the improvement of the students in applying the strategy. This instrument consist of questions items that covers all of the teaching aspects such us the way teacher explained the material, the teacher’s classroom management and etc. The teacher’s observation checklist & field notes were used to identify and collect the improvement of the researcher in applying the strategy. There were two kinds of observation checklist & field notes in this research teacher’s observation checklist & field notes and students’ observation checklist & field notes. To ensure the reliability of the score, there were two scorers, the researcher herself and the collaborator. They had to speak in good accuracy and fluency. The test was done by asking the students to speak orally. The using of instrument test in this research would find the students’ speaking ability progress in each cycle. Test is a way to know the students’ ability and force by asking the students through some questions in order to measure the students’ ability (Arikunto,1991). There were three instruments of the research to collect data : test, observation checklist and field notes, and interview.