The present study aimed to investigate the effect of blended learning on developing critical thinking skills of a sample of students at Teachers' College in King Saud University. The study sample included 58 students who were divided randomly into two groups; one was an experimental group with 27 students and the other was a control group with 31 students. The following tools were used: E-courses, Watson -Glaser Critical Thinking Test (short form.)The researcher taught the experimental group

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... ng blended learning via Blackboard, while the control group was taught using traditional education. The results showed that: There were no statistically significant differences between the experimental group and the control group in critical thinking skills.