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Casus Pro Casu

Updated Jan 25, 2023

Understanding the Rhetorical Device of Casus Pro Casu

Rhetoric is the art of effective communication, and one of its essential elements is the use of rhetorical devices. These devices are techniques or patterns of words that can enhance the persuasive impact of a message. One such device is the casus pro casu, a Latin term meaning "case for a case." In this blog article, we will explore the concept of casus pro casu, provide examples, and discuss its significance in persuasive communication.

What is Casus Pro Casu?

Casus pro casu is a rhetorical device that involves presenting a lesser or minor case to support or justify a greater or more significant case. It is a form of argumentation where a smaller issue is used as an example or precedent to convince the audience of a larger point. This technique aims to make the larger case more relatable, understandable, and persuasive by drawing analogies to a well-established or easily comprehensible similar situation.

Examples of Casus Pro Casu

To better grasp the concept of casus pro casu, let's examine a few examples:

Example 1 - Animal Testing

Imagine a speaker advocating for the abolition of animal testing for cosmetic products. They may begin by presenting a less controversial case of banning animal testing for household cleaning products. By highlighting the successful transition to cruelty-free alternatives for cleaning products, the speaker establishes a casus pro casu. They can then argue that if we can eliminate animal testing for cleaning products, we should also extend this ban to cosmetic products.

Example 2 - Gun Control

In a debate about gun control, a speaker might present a casus pro casu by discussing the regulation of other potentially dangerous objects. They could argue that society already restricts the sale and usage of certain items, such as explosives or prescription drugs, due to their potential harm. By presenting these cases, the speaker aims to create an analogy that justifies the need for stricter regulations on firearms.

Example 3 - Climate Change

When discussing the urgency of addressing climate change, a speaker might employ a casus pro casu by drawing parallels with historical environmental challenges. They may mention events like the banning of ozone-depleting substances or the successful reduction of acid rain pollution. By highlighting these cases, the speaker aims to emphasize that humanity has overcome environmental crises before and can likewise tackle the issue of climate change.

The Significance of Casus Pro Casu

Casus pro casu serves as a powerful persuasive tool by leveraging relatability and precedent. By presenting a smaller, more easily understandable case, speakers can build a bridge of understanding between their audience and the larger issue at hand. This rhetorical device aids in clarifying complex or abstract concepts, making them more tangible and relatable. Additionally, casus pro casu can reinforce the credibility of an argument by drawing upon established precedents or successful outcomes from similar situations.


The use of rhetorical devices like casus pro casu can significantly enhance the persuasive impact of communication. By employing examples and analogies, speakers can make complex arguments more accessible and relatable to their audience. Understanding and recognizing the casus pro casu technique allows us to critically analyze persuasive messages and appreciate the artistry behind effective communication.

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