The Impact of Teaching Critical Thinking on Iranian Students’ Writing Performance and Their Critical Thinking Dispositions

Abstract

This study was intended to investigate the effectiveness of teaching critical thinking on students’ writing performance and their critical thinking dispositions. To this end, 140 students were selected. 73 students were assigned to the experimental group and 67 were assigned to the control group. The experimental group received instruction in critical thinking strategies whereas the control group did not. The instruments used in this study were the researcher-developed essay test, the Ennis-Weir critical thinking essay test, and the California Critical Thinking Dispositions Inventory (CCTDI). A 2-group pretest/posttest quasi-experimental design was utilized to determine the outcome measures. Data were analyzed using descriptive statistics and independent-samples ttest. Statistically significant differences were observed in the experimental and the control groups in the total scores of the three instruments. The results indicated an improvement in students’ writing performance and their dispositions toward using critical thinking strategies. Nonetheless, some dispositional aspects such as truth-seeking, cognitive maturity, and open- mindedness did not differ significantly after the intervention.