Evaluating Source Quality
Not all evidence is equally credible, and judges and opponents will scrutinize weak sourcing. You will be able to identify markers of strong versus weak evidence.
Markers of Strong Sources
Strong sources include peer-reviewed academic journals, government data (such as the Bureau of Labor Statistics or CBO), and reporting from established, fact-checked outlets. Recency matters too — a 2024 statistic on unemployment is far more useful than one from 2009, especially on economic topics.
Red Flags
Blogs with no author credentials, advocacy sites with an obvious agenda and no methodology disclosed, and outdated statistics are all vulnerable to challenge. A savvy opponent will ask in Crossfire, 'What is the methodology behind that number?' — if a debater cannot answer, the source's credibility (and the argument) weakens.
Two debaters cite competing statistics on gun violence rates.
Debater A cites a CDC dataset with a clear methodology and multi-year sample. Debater B cites a number from an anonymous advocacy blog with no listed source. In Crossfire, Debater A asks, 'Where does your blog get that number from?' Debater B cannot answer. The judge is now primed to prefer Debater A's more credible statistic when weighing at the end of the round.
1. Which of these is generally the strongest type of source for a statistic?
2. True or False?
"Recency of a source rarely matters as long as the number sounds accurate."
Answer all 2 to check.
Judge and challenge sources the way you'd want your own evidence challenged: credentials, method, recency.