“The Effect of Teaching Design in Accordance With Cluster Thinking Strategies on First-Grade-Intermediate students’ Achievement in Science”. Journal Of Educational and Psychological Researches 15, no. 57 (April 1, 2018): 452–476. Accessed May 14, 2025. https://jperc.uobaghdad.edu.iq/index.php/jperc/article/view/154.