Dr Tom Kerns



Assignment hurley5.1

The syllogism: its form, mood, figure and validity


This assignment is due to be completed by Thursday October 29th

This exercise will be available from Oct 22nd to Nov 4th

In this assignment you will learn:

  • What a categorical syllogism is and the arrangement of its propositions into standard form
  • How to designate the terms in a syllogism as the syllogism's Major term, Minor term and Middle term.
  • How to determine the syllogism's major premise, its minor premise and its conclusion
  • How to determine the syllogism's Mood (i.e., the letter names of its propositions)
  • How to determine the syllogism's Figure (by the location of its middle term)
  • How to determine a syllogism's validity by referring to the lists of valid forms (p 247 and inside front cover)
  • The difference between a syllogism's validity from the Boolean and Aristotelian standpoints


  • Read chapter 5.1 of Hurley’s A Concise Introduction to Logic.
  • Optional: Read Hurley pp 196-98 to review the Boolean vs Aristotelian standpoints

Optional Learning Aids

Sections 5.1 of the Learning Logic program, available either on iLrn or on the CD that came with your Hurley textbook


  • Login to iLrn
  • Navigate to the assignment titled hurley5.1
  • Open that assignment and do those exercises
  • You may re-do the exercises a second time if you like, and a third time, but it won’t allow you to do them more than three times.
  • iLrn will record the score you earn on the final time you did the assignment.