Rhetorical Appeals

Logos: Precedent and Case Studies

Support arguments with relevant examples of similar situations and their outcomes.

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What & why

What it is
A logical approach that supports a recommendation by citing a relevant prior case, where a comparable situation was handled a particular way and produced a known outcome. The persuasive weight depends on how closely the precedent matches the current situation, so strong use names a specific actor, action, and measurable result rather than a vague appeal to what others do. It lets the audience reason by analogy from established evidence instead of from speculation.
Why it works

A concrete precedent answers the quiet objection behind most proposals, which is whether the idea has survived contact with reality. Pointing to a similar case that worked lets people reason by analogy, which is faster and feels safer than evaluating an untested claim from scratch. It also shifts the burden: the approach is no longer speculative, it is something others already did. Naming a recognizable example with a specific outcome makes the evidence vivid and memorable, and lowers the perceived risk of adopting it.

Before & after

These are fictional teaching examples, not accounts of real events.

Before

“Other companies have done similar things successfully.”

After

“When our north branch moved to this shared booking calendar last spring, double bookings stopped within a month, and nothing else about how it takes bookings changed. Our branch books rooms the same way, so we can expect a similar result.”

When you’ll use it

Citing how a rival rolled out the same policy without backlash

Backing a budget request with last quarter's pilot results

Pointing to a peer company's successful migration during a board vote

Referencing an earlier product launch to justify the rollout timeline

Pro tip

Use specific, relevant precedents with measurable outcomes and clear parallels.

Questions & answers

What are precedent and case studies in logical appeals?

Precedent and case studies use examples of similar situations, successful implementations, or previous decisions to support current arguments logically. They provide evidence that your proposed approach has worked before in comparable circumstances.

How do I choose effective precedents for business presentations?

Select relevant and comparable situations, use recent examples when possible, choose credible sources, explain similarities to current situation, acknowledge differences, and focus on precedents your audience will find convincing.

What makes precedents and case studies credible?

Credible precedents come from reputable sources, involve similar circumstances, include verifiable outcomes, acknowledge limitations, provide sufficient detail for evaluation, and demonstrate clear relevance to the current business situation.

Learn more

Aristotle, Rhetoric, Book II, Chapter 20 (Perseus, Tufts)
Stanford Encyclopedia of Philosophy - Aristotle's Rhetoric
Wikipedia - Paradeigma

Put it into practice

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