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From the perspective of conceptual and theoretical views of subject indexing, this study identifies three conception\u2010based approaches, Domain\u2010Oriented, Document\u2010Oriented, and Content\u2010Oriented, in conjunction with eight semantic sources in typical scientific journal articles. Based on the identification of semantic sources and conception\u2010based approaches, the experiment explores the significance of individual semantic sources and conception\u2010based approaches for the effectiveness of subject term assignment. The results of the experiment demonstrate that some semantic sources and conception\u2010based approaches are better performers than the full text\u2010based approach which has been dominant in TC fields. 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