The objective of the study was to find out whether or not there were any significant different scores obtained by the students who were taught through concept-oriented reading instruction (CORI) method and those who were not. A quasi-experimental design, specifically nonequivalent control group design was applied in this study. The result of the study showed that the students’ scores in paired sample t-test of experimental group higher than control group (-11.83 > -12.64), while in independent sample t-test, the critical value 0.05 significance level with df 35 (36-1) was 1.697 and t-obtained 1.992. It means that tobtained was higher than t-table as critical value (1.992 > 1.697). Consequently, the alternative hypothesis (Ha) was accepted and null hypothesis (Ho) was rejected. It could be concluded that, teaching reading comprehension of procedure text through Concept-Oriented Reading Instruction (CORI) method to the tenth grade students of state senior high school 13 Palembang was effective
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