The aim of this study was to examine the effectiveness of teaching philosophy on the way community of inquiry on critical thinking and its dimensions of female students in fifth grade in Yazd. The study population included all fifth grade students in Yazd in academic year 2015 – 2016. The research method was quasi-experimental with pretest-post test on experimental and control groups. For this purpose, 30 students were selected by using convenience sampling and they were randomly assigned to two groups, experimental group (n = 15) and control group (n = 15). The critical thinking questionnaire of Watson- Glazer was used for gathering data. Philosophy on the way community of inquiry was taught to the experimental group during 12 sessions (each session was 60 minutes). Results of examining hypothesis by using analysis of covariance (significance level = 0.05) showed that teaching philosophy on the way community of inquiry has effect on critical thinking and its dimensions (perception, inference, interpretation and evaluation of logical reasoning), and it has improved them.
