Understanding Circular Reasoning: What It Is, Why It Matters, and How to Avoid It (D: Circular Reasoning)

In logic and critical thinking, circular reasoning—also known as d: circular reasoning—is a logical fallacy that undermines the strength of an argument by essentially arguing in a loop, with the conclusion already assumed in the premise. Whether intentional or not, it weakens reasoning and erodes credibility in debates, science, everyday conversations, and decision-making.

This article explores what circular reasoning is, why it’s a flaw in argumentation, examples from various domains, and practical steps to avoid it.

Understanding the Context

What Is Circular Reasoning?

Circular reasoning occurs when someone uses the conclusion of an argument as one of the premises, creating a loop where the argument assumes what it seeks to prove—without providing independent evidence. Essentially, instead of supporting a claim with new or valid reasoning, the argument “whirls around” back to the starting point.

Formally speaking, a circular argument can be structured like this:

  • Premise: A
  • Premise: B (which depends on A)
  • Conclusion: A, supported by B that requires A
D: Circular Reasoning

Key Insights

This fails to provide explanatory power or empirical grounding.

Why Is Circular Reasoning a Problem?

Circular reasoning is a logical fallacy because:

  • It lacks explanatory validity: The conclusion hasn’t been proven; it’s merely restated using different words or dependent claims.
  • It prevents progress in dialogue: Neither party learns something new; discussion becomes stagnant.
  • It undermines trust and credibility: Arguments should persuade through reason, not tautology.
  • It is often hidden or subtle, making it hard to detect without critical focus.

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Final Thoughts

Examples of Circular Reasoning

1. Everyday Argument

“This movie is the best because it’s the most popular.”
Here, popularity (B) is presented as proof of quality (A), but popularity often reflects bias, marketing, or herd behavior—not inherent merit.

2. In Science and Policy

“This policy must be effective because we’ve used the same approach in the past, and it worked.”
This ignores external variables and assumes past success without evidence of causation. If effectiveness requires proving outcome, relying solely on repetition is circular.

3. Personal Justification

“I knew I was right from the start because the evidence clearly supported my view.”
If evidence depends on assuming the conclusion, the reasoning loop is intact.

How to Spot Circular Reasoning

Here’s how to detect circular arguments:

  • Ask, “Does this premise rely on the conclusion?”
  • Look for phrases like “by definition,” “it’s obvious” (without proof), or “as we know” that skip justification.
  • Check if the claim could stand alone without circular reliance.

How to Avoid Circular Reasoning in Your Arguments

  1. Ground claims in evidence: Use data, observation, or logical deduction—not assumptions.
  2. Define terms clearly: Avoid hidden-loops by specifying what you mean.
  3. Support conclusions with independent premises: Each step in your argument should build on facts or logic, not assertions that loop back.
  4. Invite counterexamples: Test your reasoning against contradictory evidence—true logic withstands scrutiny.
  5. Review and revise: After forming a point, examine whether it requires restating itself to be valid.