This script is a syllogisms tutor. It will train you in recognizing valid categorical syllogisms, as well as in identifying the mood and figure of a syllogism and the various formal fallacies that can make a syllogism invalid. A syllogism is an argument with two premises and a conclusion. A categorical syllogism is one whose premises and conclusion are all categorical statements. A categorical statement is a statement about the relationship between categories, and there are four basic relationships two categories can have. One category can be a subset of the other or not, and they can intersect or not. The four types of categorical statements that represent these four relationships are normally designated as A, E, I, and O.
A  All S is P  One category is a subset of another 

E  No S is P  The two categories do not intersect 
I  Some S is P  The two categories intersect 
O  Some S is not P  One category is not a subset of another 
A valid syllogism is one whose conclusion logically follows from its premises. To emphasize the difference between a valid argument and a sound argument, all premises and conclusions are randomly generated, such that many will be false. The validity of an argument does not depend upon whether its premises or conclusions are true. It merely depends on the formal relation between the premises and conclusion. Valid syllogisms can have false premises or false conclusions. An argument is sound when it is valid and has true premises. Validity is only part of what it takes to make an argument sound. Very few of the randomly generated syllogisms will be sound, but a fair number will be valid.

This is a training module for learning about syllogisms.
There are 2 modes to work with; 'Easy' and 'Difficult'. At the top right you can toggle between the 2 modes. In easy mode you will be able to see the info in the 'premises' field, the items in the dropdown box for 'Mood' will be colorcoded (green background) to help you identify which syllogisms are valid, the conclusion for the 'MoodFigure' combination will be visible, the tooltips (for the texts in blue color) will show and the 2 panels ('Overview of Valid Syllogisms' and 'Overview of Fallacies'; the cheatsheets) will be visible.
If you need help, hover the mouse over the 'blue' text (when in 'easy' mode) to get some instant assistance.
It is up to you to analyze the premises and its conclusion and make the appropriate selections in the section below that.


