AU - حج عمر، سوزان حسين AB - This study aimed to identify the mastery level of critical thinking skills amongst female middle school students in Saudi Arabia. A descriptive methodology was adopted, and Watson-Glaser scale for critical thinking was applied to a randomly selected sample of (611) students from several middle schools in Riyadh. The results showed that the mean scores of the student sample on the scale had reached (79.60) out of (133) for the whole scale, equivalent to (59.85%), which indicates that the mastery level of students' critical thinking is lower than the acceptable level in this research, which is (80.0%). Also, the results showed that there were differences in the level of critical thinking among students due to the grade level in favor of seventh-graders. This may also indicate that there is a decline in students' critical thinking as they grow up in the academic level, which implies. (Published abstract) http://search.shamaa.org/abstract_en.gif OP - ص ص. 229-258 T1 - مستوى إتقان مهارات التفكير الناقد لدى طالبات المرحلة المتوسطة في المملكة العربية السعودية [مقال] UL - 1 http://search.shamaa.org/fulltext.gif http://search.shamaa.org/PDF/Articles/BAJepsc/47JepscVol19No4Y2018/jepsc_2018-v19-n4_229-258.pdf النص الكامل (PDF)