Secundum quid

Secundum quid (comes from the Latin "a dicto simpliciter ad dictum secundum quid", meaning "[what is true] in a certain respect and [what is true] absolutely" or "from the statement unqualified to the statement qualified). It is a type of informal fallacy that occurs when the arguer omits the fact that a statement applies with qualifications or exceptions, or fails to recognize the difference between rules of thumb (soft generalizations, heuristics that hold true as a general rule but leave room for exceptions) and categorical propositions, rules that hold true universally.

Since it ignores the limits, or qualifications, of rules of thumb, this fallacy is also named ignoring qualifications or sweeping generalizations. The expression misuse of a principle can be used as well.

Example

Let me tell you: all great composers die young. Take Mendelssohn: he was 38. Or Mozart, just 35. And Schubert! Hundreds of songs, and he was only 31.

The arguer cites only the cases that support his point, conveniently omitting Bach, Beethoven, Brahms etc

In popular culture

The following quatrain can be attributed to C. H. Talbot:

 I talked in terms whose sense was hid,
Dividendo, componendo et secundum quid;
Now secundum quid is a wise remark
And it earned my reputation as a learned clerk.

2 Types

Instances of secundum quid are of two kinds:

• Accident — a dicto simpliciter ad dictum secundum quid (where an acceptable exception is ignored) [from general to qualified]. This is taking the usual case and inappropriately applying it to special cases. This is when we can't or don't want to list the exceptions to a reasoning, and then use it as a generalization as if there was no exception.
• Converse accident — a dicto secundum quid ad dictum simpliciter (where an acceptable exception is eliminated or simplified) [from qualified to general]. This is taking one unusual case and inappropriately applying it to all cases. This is when we focus on one exception and use it to draw a generalization. It is close to hasty generalization.

See also

• Defeasible reasoning

Further reading

• Dowden, Bradley (2010). "Fallacies § Secundum quid". Internet Encyclopedia of Philosophy.
• Bunnin, Nicholas; Yu, Jiyuan (2008). "Fallacy of secundum quid". The Blackwell Dictionary of Western Philosophy. John Wiley & Sons. p. 250. ISBN 978-0-470-99721-5.
• Coffey, Peter (1912). The Science of Logic. Longmans, Green, and Company. p. 309. OL 7104938M.
• Joseph, H. W. B. (1916). "The fallacy of Secundum Quid". An Introduction to Logic (2nd ed.). Clarendon Press. p. 589. OCLC 373124.
• Parry, William T.; Hacker, Edward A. (1991). "A brief history of the fallacies of accident and secundum quid". Aristotelian Logic. SUNY Press. p. 438. ISBN 978-0-7914-0690-8.
• Walton, Douglas (1990). "Ignoring Qualifications (Secundum Quid) as a Subfallacy of Hasty Generalization" (PDF). Logique et Analyse. 33 (129–130): 113–154. ISSN 2295-5836.