The Effect of a Proposed Strategy According to the Model (Heisig & Verbeck) on the Achievement of Mathematics and Engineering Thinking among the Fifth Science / Biological Students. jperc [Internet]. 2024 Mar. 13 [cited 2025 May 17];21(80):245-66. Available from: https://jperc.uobaghdad.edu.iq/index.php/jperc/article/view/1702