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Development and Preliminary Evaluation of an Outdoor STEM-Based Extracurricular Activity Toolkit for Supporting Grade 6 Students’ Entrepreneurial Skills in Problem-Solving, Creative Thinking, and Collaboration. Sci. Ess. J [Internet]. 2026 Sep. 22 [cited 2026 Oct. 23];42(2):289-305. Available from: https://ejournals.swu.ac.th/sej/article/view/17377