(1) Speaking to celebrate tends to center on claims of value. For
(1) Speaking to persuade usually focuses on claims of policy and
secondarily on claims of value, because you want an audience to change
their beliefs, attitudes, values, or behaviors.
2. Reasoning is contextually bound. The rules of logic can change depending on the
physical setting of the speech, the kind of speech one is delivering, and the people who
are hearing it.
3. Claims of fact tend to have easily identifiable warrants, while claims of value and
policy are much more likely to have complex forms of reasoning.
4. Speakers are more likely to be unaware of their reasoning when an audience is
friendly and familiar to them, and are typically more careful about their reasoning when
making arguments to unfamiliar audiences.
H. Fallacies: When Reason Slips Up
1. A fallacy is an error in reasoning. In argumentation, a fallacy can make an
argument invalid and can be deliberate or accidental.
2. Speakers are prone to fallacious reasoning when making arguments about
something that they are passionate or emotional about.
3. There are a wide variety of types of errors in reasoning:
a)
Ad hominem fallacies reduce an issue to a person’s character unfairly.
b)
Ad baculum fallacies are a fear appeal that threatens force or violence if
the audience does not accept the will of the speaker.
c)
Ad misericordiam fallacies appeal to the misfortune and plight of
another.
d)
Ad populum fallacies appeal to popular feelings or commonly held
emotions about a claim or an assertion that is not supported by good evidence.
e)
Bandwagon fallacies are usually exciting and operate on the fear that
audiences may be missing out.
f)
Either-or fallacies make claims that you have only two choices in making
a decision, when there may in fact be many other choices.
g)
Non sequitur fallacies typically concern a conclusion that does not
logically follow from one or more premises.
h)
Red-herring fallacies purposely misdirect the attention of the audience.
i)
Slippery slope fallacies make the argument that something bad or
undesirable will inevitably happen.
j)
Straw-person fallacies occur when someone oversimplifies an
opponent’s argument or claims that the opponent argued something that she or
he didn’t.
II. Organizing Persuasive Speeches
A. Learning Objectives
1. Explain how persuasive speeches of fact, value, and policy differ.
2. List the most common types of policy speech patterns.
B. Since persuasion entails some degree of risk, you should make sure your reasons for
urging a decision about something hold up under logical scrutiny.
C. Organizing Persuasive Speeches of Fact
1. Persuasive speeches of fact usually entail some degree of uncertainty about
something that has happened, that will happen, or that should happen.
2. Because persuasive speeches of fact almost always concern an event of the past,
the most common forms of organization are temporal or topical, which are discussed in
chapter 7.
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