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Dholfiqar Issa Othman and dr.Gulistan Mohammed saido 2026. The effectiveness of the problem tree strategy in developing higher-order thinking skills among eighth-grade students in the science subject. Journal of College of Education. 63, 2 (May 2026), 643–652. DOI:https://doi.org/10.31185/eduj.Vol63.Iss2.4392.