LogicLens

Fault Library

Explore common faults in reasoning and communication that can undermine critical thinking. Understanding these patterns helps you identify flawed reasoning and manipulation in arguments.

Logical Fallacies

Errors in reasoning that weaken an argument and lead to faulty conclusions.

Ad Hominem
Category: Logical Fallacy

Attacking the person instead of addressing their argument

Appeal to Popularity
Category: Logical Fallacy

Appealing to popularity or the fact that many people do something as a validation

Appeal to Authority
Category: Logical Fallacy

Claiming something is true because an authority figure says it is, without providing evidence

Appeal to Emotion
Category: Logical Fallacy

Replacing sound logical reasoning with emotional manipulation

Appeal to Tradition
Category: Logical Fallacy

Arguing that something is good or right because it's traditional or has been done for a long time

Relevance Fallacy
Category: Logical Fallacy

Appealing to irrelevant factors or considerations

Appeal to Ignorance
Category: Logical Fallacy

Claiming something is true because it hasn't been proven false (or vice versa)

Association Fallacy
Category: Logical Fallacy

Claiming that qualities of one thing are inherently qualities of another, simply by association

Cherry Picking
Category: Logical Fallacy

Selectively choosing data that supports your argument while ignoring contradictory evidence

Argument to Moderation
Category: Logical Fallacy

Assuming that the middle position between two extremes must be correct

Two Wrongs Make a Right
Category: Logical Fallacy

Justifying an action by pointing out that others do the same thing

Many Questions
Category: Logical Fallacy

Asking a question that contains a presupposition that the respondent may wish to deny

Circular Reasoning
Category: Logical Fallacy

Using the conclusion as a premise, creating a circular argument

Causal Fallacy
Category: Logical Fallacy

Assuming correlation implies causation.

False Analogy
Category: Logical Fallacy

Drawing a comparison between two things that are not actually comparable

False Dilemma
Category: Logical Fallacy

Presenting only two options when more exist (black-and-white fallacy)

Hasty Generalization
Category: Logical Fallacy

Drawing broad conclusions from insufficient evidence

Distraction Fallacy
Category: Logical Fallacy

Introducing an irrelevant topic to divert attention from the original issue

Slippery Slope
Category: Logical Fallacy

Arguing that a relatively small first step will inevitably lead to extreme consequences

Fallacy of Composition
Category: Logical Fallacy

Assuming that what is true of the parts must be true of the whole

Gambler's Fallacy
Category: Logical Fallacy

Believing that past random events affect the probability of future random events

Rhetorical Devices

Persuasive techniques used in writing or speech to convince or influence the audience.

Loaded Language

Words and phrases that attempt to influence an audience by appealing to emotions rather than logic.