الفهرس 
الفصل الاوليوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
The current research aimed to reveal the effectiveness of using the brainstorming strategy in developing metacognitive skills in science among Preparatory school students with different levels of achievement, and the research sample consisted of (80) students from the first grade of middle school in Dakahlia Governorate, and they were divided into two groups, one of which is an experimental number of (40) students at Selka Preparatory Mixed School studied the ”energy” unit using the brainstorming strategy to develop metacognitive skills in science among middle school students with different levels of achievement, The other is an officer numbering (40) students at Hawawsha School for Basic Education studied the unit ”energy” in the usual way, and the researcher has prepared experimental treatment materials, namely: ”teacher’s guide, student activity brochure”, and the preparation of research tools, namely: ”achievement test in the energy unit, and metacognitive skills test”, and the results of the research have reached the effectiveness of the brainstorming strategy in the development of achievement and metacognitive skills in science among Preparatory school students with different levels of achievement, and in light of these results the researcher presented Some recommendations, suggested research.