AU - حسن، هيفاء حميد. AU - جاسم، سلوان خلف AB - The current research aims to find out (( the effectiveness of the strategy The Keys of Knowledge in the development of critical thinking among students in the middle school reading material )). The researcher, used the experimental method in order to achieve the aim of the research conducted the experiment , which lasted for a full semester of the academic year 2014-2015, researcher chosen preparatory Diyala for boys in the district Baquba intentionally. To apply the experience and identified the sample (50) students by 25 students experimental group, and 25 students for the control group, the researcher has conducted a parity statistically between the two sets of research in the following variables (Degrees Students' in Arabic language for the half year for the academic year 2014-2015 , chronological age, level of achievement for parents, IQ, language ability, critical thinking). Researcher adopted experimentally determined is located in the part-tuning the experimental field designs, and experience has started in 18.02.2015 and lasted until the day 05.09.2015 and after completion of the test results were analyzed statistically using Altaia test for two independent samples T-test, and the results showed superiority the experimental group students studying reading material strategy. The Keys of Knowledge to the control group students who Are studying the same material in the usual way in the development of critical thinking. (Published Abstract) http://search.shamaa.org/abstract_en.gif ID - 117955 OP - ص ص. 112-146 T1 - فاعلية استراتيجية مفاتيح المعرفة في تنمية التفكير الناقد لدى طلاب الصف الخامس الأدبي في مادة المطالعة [مقال] UL - 1 http://search.shamaa.org/fulltext.gif https://www.iasj.net/iasj/article/123218 النص الكامل (PDF)