Logical
Fallacies
Argument
and
Reasoning
Scenario:
Toby and Michael are debating an issue. Toby
is presenting an argument with facts and
logical conclusions. Michael is not prepared
for this debate, so he cannot present a
meaningful, cohesive argument. He uses
other tactics that are not productive to the
discussion. What types of things might
Michael resort to saying to try and make it
seem like he has an actual point?
THINK
P
A
I
R
Share your
answer
with your
partner
Scenario:
Toby and Michael are debating
an issue. Toby is presenting an
argument with facts and logical
conclusions. Michael is not
prepared for this debate, so he
cannot present a meaningful,
cohesive argument. He uses
other tactics that are not
productive to the discussion.
What types of things might
Michael resort to saying to try
and make it seem like he has an
actual point?
S
H
A
R
E
Decide
what
answer to
share with
the class
Scenario:
Toby and Michael are debating
an issue. Toby is presenting an
argument with facts and logical
conclusions. Michael is not
prepared for this debate, so he
cannot present a meaningful,
cohesive argument. He uses
other tactics that are not
productive to the discussion.
What types of things might
Michael resort to saying to try
and make it seem like he has an
actual point?
These tactics often are
used when people do
not have a good
argument or are not
knowledgeable about
the topic.
Some of these tactics
are also forms of
logical fallacies.
Name
Calling
Using False
Information
Changing
the Subject
Exaggeratin
g
• Learn about the concept
of a logical fallacy
• Learn about common
logical fallacies
• Attempt to identify
logical fallacies
Today We Will:
• An argument that may seem
strong, but is proven wrong
with reasoning and further
examination
• Often meant to confuse or
mislead
Logical Fallacy
• Ad Hominem
• Straw Man
• Slippery Slope
• Red Herring
• Hasty
Generalization
• Ad Populum
Examples of
Logical Fallacies:
Attacking the person
making the argument,
rather than addressing
the argument the person
is making
Ad Hominem
You're too
young to
understand
the issues!
I'm 30 years old,
and you didn't
even address my
argument
Intentionally
misrepresenting the other
side's argument to make it
easier to defeat instead of
addressing the other side's
actual argument
Straw Man
We can't spend
all of our money
on marketing!
Not all of our
money! I just said
I want a small
increase in the
marketing
budget.
The argument that one
event will lead to a series of
events and eventually will
lead to something very bad
Slippery Slope
If I don't study
for my test, I'll
fail chemistry,
get a low GPA,
and I'll never get
into college!
I
D
E
N
T
I
F
Y
Let's see
if we can
identify some
logical fallacies
I
D
E
N
T
I
F
Y
"If we lower the
voting age to 16, then
next thing you know
kids who are 14 will
want to vote. Pretty
soon we will have
people who are 10
years old voting!"
That's not an
argument, that
is:
A. Ad Hominem
B. Straw Man
C. Slippery
Slope
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Ad Hominem
B. Straw Man
C. Slippery
Slope
"If we lower the
voting age to 16, then
next thing you know
kids who are 14 will
want to vote. Pretty
soon we will have
people who are 10
years old voting!"
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Ad Hominem
B. Straw Man
C. Slippery
Slope
"Self-driving
cars should be
supported
because they
will help create
safer roads."
"You value
technology over
people supporting
their families!
That's a terrible
position to have
on the topic!"
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Ad Hominem
B. Straw Man
C. Slippery
Slope
"Self-driving
cars should be
supported
because they
will help create
safer roads."
"You value
technology over
people supporting
their families!
That's a terrible
position to have
on the topic!"
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Ad Hominem
B. Straw Man
C. Slippery
Slope
Why would I listen
to your thoughts on
prison reform? I
know who you
voted for last
election. I think you
have terrible
judgement!
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Ad Hominem
B. Straw Man
C. Slippery
Slope
Why would I listen
to your thoughts on
prison reform? I
know who you
voted for last
election. I think you
have terrible
judgement!
Let's learn a
few more
logical
fallacies
Red Herring
Distracting from the
real issue with an
irrelevant point or
piece of information
I know you
want the
company to
raise wages
because of our
increased
profits.
We currently
offer employees
great benefits!
Hasty
Generalization
Making a claim or
drawing a conclusion
without having
enough information
My friend took a
philosophy class and
said it was so
challenging. All
philosophy classes must
be hard. I'm never
taking one!
Ad Populum
The argument that
because something is
popular it is good or
the truth
All these people
agree with me.
I'm definitely
right!
I
D
E
N
T
I
F
Y
Let's see if we
can identify
some more
logical fallacies
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Red Herring
B. Hasty
Generalization
C. Ad Populum
Good morning, officer. I
know you pulled me
over for speeding, but
don't you think there
are bigger crimes going
on right now? You
shouldn't give me a
ticket.
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Red Herring
B. Hasty
Generalization
C. Ad Populum
Good morning, officer. I
know you pulled me over
for speeding, but don't you
think there are bigger
crimes going on right now?
You shouldn't give me a
ticket.
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Red Herring
B. Hasty
Generalization
C. Ad Populum
The iPhone is the
best Smartphone
because it is the
most popular
Smartphone in the
United States.
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Red Herring
B. Hasty
Generalization
C. Ad Populum
The iPhone is the
best Smartphone
because it is the
most popular
Smartphone in the
United States.
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Red Herring
B. Hasty
Generalization
C. Ad Populum
I once met someone
with that major. She
was so nice! I bet
everyone who
studies that is nice
too.
I
D
E
N
T
I
F
Y
That's not an
argument, that
is:
A. Red Herring
B. Hasty
Generalization
C. Ad Populum
I once met someone
with that major. She
was so nice! I bet
everyone who
studies that is nice
too.
Understanding logical
fallacies will allow you to
avoid them while making
arguments. You will also
be equipped to call out
logical fallacies when you
hear them.

G9 Logical Fallacies Presentation and Lesson

  • 1.
  • 2.
    Scenario: Toby and Michaelare debating an issue. Toby is presenting an argument with facts and logical conclusions. Michael is not prepared for this debate, so he cannot present a meaningful, cohesive argument. He uses other tactics that are not productive to the discussion. What types of things might Michael resort to saying to try and make it seem like he has an actual point? THINK
  • 3.
    P A I R Share your answer with your partner Scenario: Tobyand Michael are debating an issue. Toby is presenting an argument with facts and logical conclusions. Michael is not prepared for this debate, so he cannot present a meaningful, cohesive argument. He uses other tactics that are not productive to the discussion. What types of things might Michael resort to saying to try and make it seem like he has an actual point?
  • 4.
    S H A R E Decide what answer to share with theclass Scenario: Toby and Michael are debating an issue. Toby is presenting an argument with facts and logical conclusions. Michael is not prepared for this debate, so he cannot present a meaningful, cohesive argument. He uses other tactics that are not productive to the discussion. What types of things might Michael resort to saying to try and make it seem like he has an actual point?
  • 5.
    These tactics oftenare used when people do not have a good argument or are not knowledgeable about the topic. Some of these tactics are also forms of logical fallacies. Name Calling Using False Information Changing the Subject Exaggeratin g
  • 6.
    • Learn aboutthe concept of a logical fallacy • Learn about common logical fallacies • Attempt to identify logical fallacies Today We Will:
  • 7.
    • An argumentthat may seem strong, but is proven wrong with reasoning and further examination • Often meant to confuse or mislead Logical Fallacy
  • 8.
    • Ad Hominem •Straw Man • Slippery Slope • Red Herring • Hasty Generalization • Ad Populum Examples of Logical Fallacies:
  • 9.
    Attacking the person makingthe argument, rather than addressing the argument the person is making Ad Hominem You're too young to understand the issues! I'm 30 years old, and you didn't even address my argument
  • 10.
    Intentionally misrepresenting the other side'sargument to make it easier to defeat instead of addressing the other side's actual argument Straw Man We can't spend all of our money on marketing! Not all of our money! I just said I want a small increase in the marketing budget.
  • 11.
    The argument thatone event will lead to a series of events and eventually will lead to something very bad Slippery Slope If I don't study for my test, I'll fail chemistry, get a low GPA, and I'll never get into college!
  • 12.
    I D E N T I F Y Let's see if wecan identify some logical fallacies
  • 13.
    I D E N T I F Y "If we lowerthe voting age to 16, then next thing you know kids who are 14 will want to vote. Pretty soon we will have people who are 10 years old voting!" That's not an argument, that is: A. Ad Hominem B. Straw Man C. Slippery Slope
  • 14.
    I D E N T I F Y That's not an argument,that is: A. Ad Hominem B. Straw Man C. Slippery Slope "If we lower the voting age to 16, then next thing you know kids who are 14 will want to vote. Pretty soon we will have people who are 10 years old voting!"
  • 15.
    I D E N T I F Y That's not an argument,that is: A. Ad Hominem B. Straw Man C. Slippery Slope "Self-driving cars should be supported because they will help create safer roads." "You value technology over people supporting their families! That's a terrible position to have on the topic!"
  • 16.
    I D E N T I F Y That's not an argument,that is: A. Ad Hominem B. Straw Man C. Slippery Slope "Self-driving cars should be supported because they will help create safer roads." "You value technology over people supporting their families! That's a terrible position to have on the topic!"
  • 17.
    I D E N T I F Y That's not an argument,that is: A. Ad Hominem B. Straw Man C. Slippery Slope Why would I listen to your thoughts on prison reform? I know who you voted for last election. I think you have terrible judgement!
  • 18.
    I D E N T I F Y That's not an argument,that is: A. Ad Hominem B. Straw Man C. Slippery Slope Why would I listen to your thoughts on prison reform? I know who you voted for last election. I think you have terrible judgement!
  • 19.
    Let's learn a fewmore logical fallacies
  • 20.
    Red Herring Distracting fromthe real issue with an irrelevant point or piece of information I know you want the company to raise wages because of our increased profits. We currently offer employees great benefits!
  • 21.
    Hasty Generalization Making a claimor drawing a conclusion without having enough information My friend took a philosophy class and said it was so challenging. All philosophy classes must be hard. I'm never taking one!
  • 22.
    Ad Populum The argumentthat because something is popular it is good or the truth All these people agree with me. I'm definitely right!
  • 23.
    I D E N T I F Y Let's see ifwe can identify some more logical fallacies
  • 24.
    I D E N T I F Y That's not an argument,that is: A. Red Herring B. Hasty Generalization C. Ad Populum Good morning, officer. I know you pulled me over for speeding, but don't you think there are bigger crimes going on right now? You shouldn't give me a ticket.
  • 25.
    I D E N T I F Y That's not an argument,that is: A. Red Herring B. Hasty Generalization C. Ad Populum Good morning, officer. I know you pulled me over for speeding, but don't you think there are bigger crimes going on right now? You shouldn't give me a ticket.
  • 26.
    I D E N T I F Y That's not an argument,that is: A. Red Herring B. Hasty Generalization C. Ad Populum The iPhone is the best Smartphone because it is the most popular Smartphone in the United States.
  • 27.
    I D E N T I F Y That's not an argument,that is: A. Red Herring B. Hasty Generalization C. Ad Populum The iPhone is the best Smartphone because it is the most popular Smartphone in the United States.
  • 28.
    I D E N T I F Y That's not an argument,that is: A. Red Herring B. Hasty Generalization C. Ad Populum I once met someone with that major. She was so nice! I bet everyone who studies that is nice too.
  • 29.
    I D E N T I F Y That's not an argument,that is: A. Red Herring B. Hasty Generalization C. Ad Populum I once met someone with that major. She was so nice! I bet everyone who studies that is nice too.
  • 30.
    Understanding logical fallacies willallow you to avoid them while making arguments. You will also be equipped to call out logical fallacies when you hear them.