This study aimed to investigate whether the THIEVES strategy is effective or not in teaching reading comprehension of the descriptive text to students in the eighth grade at SMP Negeri 2 Ketungau Tengah, Sintang, Kalimantan Barat. It also investigates how effective it is. This research is a one-group pre-test and post-test design. In this research, the total population is 36 students, 18 from VIII A and 18 from VIII B. The researchers used random cluster sampling to select 18 students from class VIII A as the research sample. The researchers also collected and analyzed pre-test and post-test data using a t-test. The average pre-test score was 52.5, while the average post-test score was 62.5. The result of the t-test was 4,41, as shown by the data. Based on the above data analysis, the null hypothesis (Ho) is rejected, and the alternative hypothesis (Ha) is accepted because the t-test was higher than the t- table (4.41>1.740). Therefore, it indicated that the THIEVES strategy is effective in teaching reading comprehension. In addition, the effect size was 1,19, indicating a strong effect (>1.00). In conclusion, implementing the THIEVES strategy in teaching reading comprehension of descriptive text to the eight grade students in the school is highly effective.
                        
                        
                        
                        
                            
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