Composition/Division
Fallacy Summary: Assume the whole shares parts’ traits or vice versa.
What is true of individuals is projected onto the group, or group attributes are projected onto each member without justification. Research context: Informal-logic and argumentation research treats fallacies as structural problems in reasoning. A conclusion can sound persuasive while still being weak if the link between premises, evidence, and conclusion is not valid. Pattern-specific focus: Assume the whole shares parts’ traits or vice versa. Practical review method: separate factual claims from interpretation, check source quality, and test whether the conclusion survives alternative explanations.
“Dunes open as a park permanently. The remaining five candidates — current Supervisor Alan Wong, Natalie Gee, Albert Chow and David Lee — said they all opposed Proposition K and would support finding a way to bring cars back to the Great Highway. Still, getting anything on the ballot”
Counting error: states 'remaining five candidates' but lists only four names (Wong, Gee, Chow, Lee)
How to recognize composition/division yourself
- A rhetorical move replaces proof (for example, popularity, authority, or insult).
- Causation is claimed without ruling out alternatives or coincidence.
- The argument is reduced to an artificial either/or choice.
- Emotion is used to drive agreement where evidence should carry the burden.
Verification questions
- Which premise is doing the critical work, and is it actually supported?
- Does the conclusion logically follow, or does rhetoric bridge the gap?
- What alternative explanation would still fit the observed facts?
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High offenders
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