Alnoor Abdulghani Mutahar , Guo yuanxiang , Feras abudhim , Sheriff Ghali , Effect of a Proposal Teaching Strategy on the Students Common Errors, The Social Sciences, Volume 3,Issue 8, 2008, Pages 587-593, ISSN 1818-5800, sscience.2008.587.593, (https://makhillpublications.co/view-article.php?doi=sscience.2008.587.593) Abstract: The study examines the efficacy of a proposed strategy for diagnostic teaching in remedying the student’s common errors in learning mathematics through the present model of teaching, which depends on diagnosis and treatment of the educational problems that face the students and improve students’ instructional level and eliminate the educational problems that may hinder student learning. The study identified the most important steps to build a model of teaching which are summarized in preparation of the strategy and the concept of mastery and the style of measured concept, then preparation of teaching diagnostics and treatment through dividing and arrangement of content, teaching planning and preparation for the diagnostic tests and final preparation of treatment methods. Also, the study defined the procedures for effective application of the diagnostic teaching that may help in managing the educational problems which face students, especially those who suffer from low level of achievement. Keywords: Proposal teaching strategy;common errors;students;mathematics;educational problems