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The study aimed to uncover the effect of the Osborne-Barnes model: Creative problem solving in improving grammar skills of third-grade intermediate students. A quasi-experimental approach was used to design two equivalent groups. The sample of the study consisted of (54) female students who were selected from the third intermediate grade in the "eleventh intermediate school" in the Najran region in the Kingdom of Saudi Arabia. They were distributed into two control groups consisting of (27) male and experimental students, consisting of (27) female students. The Grammar Skills Test was used as a data collection tool. The results showed that there were statistically significant differences between the averages of the female students on the post-measurement grammar skills test in favor of the experimental group. This indicates the existence of the effect of the Osborne-Barnes model, a creative solution to problems in improving the grammar skills of middle-grade third-grade students. The study recommended the necessity of conducting training courses for teachers in order to familiarize them with the Osborne-Barnes model, and the mechanism of its application in the classroom
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