Claim-Evidence-Reasoning: The Core Structure of Persuasion

The Three Components

The claim is your main point -- the assertion you want your audience to accept. It should be specific, debatable, and significant. 'Climate change is real' is too broad. 'Carbon taxes are the most cost-effective method of reducing emissions' is specific, debatable, and significant.

The evidence is the factual support for your claim: data, statistics, expert testimony, examples, research findings. Evidence must be relevant to your specific claim, from credible sources, and sufficient in quantity and quality. A single anecdote is rarely enough; a pattern of evidence from multiple sources is much stronger.

The reasoning explains how and why your evidence supports your claim. This is the most commonly neglected component. Many arguers present a claim and evidence and assume the connection is obvious. It is not. You must explicitly explain the logical connection: 'This evidence supports my claim because...'

Why Reasoning Is the Key Component

Evidence does not speak for itself. The same piece of evidence can be used to support different claims depending on the reasoning applied to it. A rise in average global temperature is evidence, but the reasoning determines what claim it supports: evidence of climate change, evidence of natural cycles, evidence of measurement error, depending on the reasoning.

Reasoning is where your analytical ability shines. It demonstrates that you have not just gathered facts but have thought critically about what those facts mean. It is also where your argument is most vulnerable -- if your opponent can show that your evidence does not actually support your claim for the reasons you state, your argument collapses even if the evidence is true.

Strong reasoning anticipates alternative interpretations of the evidence. 'This evidence might seem to support the opposing view because of X, but when we account for Y and Z, it actually supports my claim because...' This demonstrates depth of analysis and preempts counterarguments.

Building CER Arguments in Practice

Start with your claim. Make it as precise as possible. Vague claims are hard to support and easy to attack. Then gather the strongest evidence you can find. Prioritize evidence from authoritative sources, with large sample sizes, that has been replicated or verified.

For each piece of evidence, write out the reasoning explicitly. Force yourself to explain the connection even if it seems obvious. This exercise often reveals gaps in your logic that you can address before an opponent finds them.

A complete argument might look like: 'Raising the minimum wage to $15/hour [claim] would reduce poverty rates, as demonstrated by the Seattle Natural Experiment which found a 6% decrease in households below the poverty line after the minimum wage increase [evidence]. This occurred because higher wages directly increase the income of the lowest-earning workers, who spend a higher proportion of their income on necessities, creating a multiplier effect on local economies [reasoning].'

• •CER stands for Claim, Evidence, and Reasoning -- the three pillars of any argument.
• •Claims should be specific, debatable, and significant.
• •Evidence must be relevant, credible, and sufficient.
• •Reasoning (explaining how evidence supports the claim) is the most commonly neglected component.
• •Explicitly stating your reasoning reveals gaps in logic and preempts counterarguments.