أثر إستراتيجيتي المتشابهاتِ وتنشيط ِالمعرفة السابقة في اكتسابِ المفاهيمِ النحوية عندَ طلابِ الصف الرابع العلميِّ
Current research aims to: The effect of each of the strategies of the similarities and ctivate prior knowledge in the acquisition of grammatical concepts at the fourth-grade science students. To investigate the range of research put the main researcher null hypothesis as follows: There are no statistical differences between the average scores of the first experimental group students who are studying the strategy of similarities, and the average score for the second experimental group students who are studying a strategy to activate prior knowledge, and the average score for the control group students who are studying in the usual way at the level of significance 0.05 in the acquisition of concepts grammatical. This search is determined by: 1) Students in fourth grade science middle and high school day of the General Directorate for Educational Baghdad Rusafa third of the academic year 2012-2013. 2) topics of grammatical rules of the Arabic language book to be taught to grade student's scientific quarter of