Although there are many classical logical fallacies, the most common of which
we will discuss in the Flaw in the Reasoning section, several scenarios that
occur in LSAT Weaken question stimuli are easy to recognize and attack:
1. Incomplete Information. The author fails to consider all of the
possibilities, or relies upon evidence that is incomplete. This flaw can
be attacked by bringing up new possibilities or information.
2. Improper Comparison. The author attempts to compare two or more
items that are essentially different.
3. Qualified Conclusion. The author qualifies or limits the conclusion in
such a way as to leave the argument open to attack.
While these three scenarios are not the only ways an argument can be weak,
they encompass a number of the errors that appear in LSAT stimuli.
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