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Convergent argument structure
From Debatepedia
According to Discovering the World through Debate, convergent argument structure involves "Two or more bits of evidence that, in combination with one another, support a claim" (247).
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"Works Cited"
Trapp, Robert, et al. Discovering the World through Debate: A Practical Guide to Educational Debate for Debaters, Coaches, and Judges. Third Edition. New York: IDEA Press Books, 2005.