Theodore Gracyk
Philosophy 110: Practical Reasoning


Sample Portfolio Page: Modus Ponens

This page has all four elements of a correct page:

  1. At the top, it labels the category of argument. 
  2. It documents the source. (Provide the same sort of documentation that would be used for a citation in a college research paper.)
  3. It identifies the issue in the form of a question. 
  4. It reconstructs the argument in standard form, then evaluates its soundness. (For the fallacies, we skip the standard form reconstruction but explain how the fallacy occurs in the example.) It explicitly states whether the argument is sound or unsound.

          

  Modus Ponens  

 

Death Penalty 

"If the death penalty results in more 
murders not being convicted, wouldn't 
it be better to do away with it? Let's 
focus on keeping the streets safe, not 
revenge." 
-- Thomas Kirk


Source: Star Tribune, March 4, 2003
     http://www.startribune.com/opinion/

   

Issue: Should we abolish the death penalty?

  1. If the death penalty results in more murderers not being convicted, then the death penalty should be abolished.
  2. The death penalty results in more murderers not being convicted.  

          The death penalty should be abolished.

 

The argument is a valid modus ponens pattern. But I do not know that the second premise is true. So I suspend judgment on that premise, and the argument is not sound.

 

 

 

 

 

 

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    Last updated March 15, 2004