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This article presents nature of scientific hypotheses, which play important roles in scientific inquiry processes, but gain little attention in science education communities especially in Thailand. It aims to present that scientific hypotheses have many types including descriptive hypotheses, explanatory hypotheses, and procedural hypotheses. But, many often understand hypotheses as predictions of what would happen. Therefore, the article suggests that students should understand nature of scientific hypotheses as well as practice generating scientific hypotheses by which teachers can facilitate using a number of strategies especially abductive reasoning.
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