Aristotle’s Proofs Logos Ethos pathos.

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Presentation transcript:

Aristotle’s Proofs Logos Ethos pathos

Logos Arguments rooted in logic and/or reasoning Uses evidence to support positions Ways to use Logos Inductive Deductive Causal Analogical

Inductive Reasoning that goes from particular to general Example: Jane is in great shape, and she jogs. (Observation) Bill looks terrific, and he jogs. (Observation) Kim’s great muscle definition is from jogging. (Observation, Inference) Therefore, people who jog look good. (Generalization)

Evaluating Inductive Arguments Are the observations accurate? Are there enough observations to justify the generalization? Don’t Rush to Conclusions!

Evaluation Examples Example 1 Example 2 Jimmy plagiarized his Com 299 final paper. All Com 299 students plagiarize. Example 2 My cat is gray. My sister’s cat is gray. The cat at the pet store is gray. All cats are gray.

Deductive Arguments Reasoning that goes from general to specific. Example: If you jog, you will look like you’re in shape. (Major Premise) Jane jogs. (Minor Premise) Therefore, Jane looks like she’s in good shape. (Conclusion)

More Deductive Examples Example 1, from MLK, Jr “I Have a Dream” All people are created equal. I am a person. Therefore, I am equal to other people. Example 2 God will reward non-violence We are pursuing our dreams non-violently God will grant us our dreams

Evaluating Deductive Arguments Analyze the accuracy and validity Are the premises true? Can the conclusion be logically derived from the premises?

Evaluating Deductive Arguments Continued Compare the following deductive arguments Example 1 People who text and drive are more likely to have accidents than are those who do not. Jack regularly texts while he drives. Therefore, Jack is more likely to have an accident than those who do not text and drive. Example 2 People who do not text and drive are more likely to have accidents than are those who do. Jill never texts and drives. Therefore, Jill is more likely to have an accident than those who do text and drive

Types of Syllogisms Categorical Syllogism Has 1 word appear twice, but not in all 3 parts (Not both…., and....) EX: No geese are felines. Some birds are geese. Therefore, some birds are not felines.

Types of Syllogisms Cont Disjunctive Syllogism The major premise has an either or statement. (Either…., or....) EX: Either the Sun orbits the Earth or the Earth orbits the Sun. The Sun does not orbit the Earth. Therefore, the Earth orbits the Sun.

Types of Syllogisms Cont Conditional Syllogism Involves an “If…, then….” statement as the conclusion. EX: Ladies prefer Axe Body Spray. Axe Body Spray smells great. If you use Axe Body Spray, you will attract ladies.

Types of Syllogisms Cont Enthymemes Missing one of the parts of the syllogism. EX: They are U.S. citizens. They are entitled to due process.

Causal One condition brings about another Avoid False Cause Fallacies Ensure that A causes B!

Analogical Compares something unfamiliar to the audience to something that is/could be familiar Avoid an invalid analogies

Ethos Is derived from the speaker or the source of the information Is composed of competence, character, knowledge, etc of the speaker/source

Pathos Appeals to audience’s emotions The emotions can range from glee to fear The speaker/writer should always consider the ethics of the communication

Types of Claims Fact value policy

Claims of Fact What IS or IS NOT true Past, present, projection Something that can be researched and proven through research Burden of Proof Must define terms, what do your statistics mean? How does your evidence “prove” something

Claims of Value What is right/wrong, moral/immoral, good/bad, just/unjust Always involves quality judgments Burden of Proof Define terms…what does it mean to you to be moral/immoral Identify the criteria or standard by which to evaluate the claim of value

Claims of Policy What should be done Will always involve an agent of action Burden of proof Problem exists An inherent barrier to solving the problem An action statement to attempt to correct the problem

Americans overvalue athletic competition.

The United States prison system should increase programs to rehabilitate inmates. POLICY

Fastening seatbelts saves lives. FACT

The United States federal government should substantially increase the number of and/or substantially expand beneficiary eligibility for its visas for one or more of the following: employment-based immigrant visas, nonimmigrant temporary worker visas, family-based visas, human trafficking-based visas. POLICY

Computer technology will change American education. FACT

Political parties are bad for effective government in the United States. VALUE

Toulmin’s Model of Argumentation How to construct an argument in any speech or discussion EVIDENCE CREDIBILITY CLAIM WARRANT QUALIFIER EVIDENCE REBUTTAL

Claim An assertion regarding a stance on a topic or idea It is an assertion of fact, value, or policy Posting private information on social networking sites like Facebook poses significant security risks.

Evidence Credibility The qualifications of the author of the quoted work In debate the evidence credibility is not fully stated in a debate round, but is typed and available for examination by opponents In a debate round ONLY the LAST NAME and YEAR of the article/source is read aloud Regular Speech Example: According to the Computer Crime and Intellectual Property web site developed by the Cyberstalking Division of the U.S. Department of Justice and accessed on September 6, 2008 Debate Example U.S. Department of Justice, Accessed 2008

Evidence The quoted words used in debate to support the claim originally made Is created by reading only important underlined material from an article. When making evidence for debate all words in a paragraph or between paragraphs of quoted material must be present (though not read aloud) to ensure that nothing is taken out of context

THE MOST IMPORTANT PART OF TOULMIN’S MODEL! Warrant THE MOST IMPORTANT PART OF TOULMIN’S MODEL! Connects the Evidence to the claim Explains WHY the evidence matters and how you are interpreting/applying the evidence to your position/claim

Qualifier The exceptions to the rule Possible Qualifiers? This is where one admits that sometimes a claim is not true in all instances Cats are the Best Pet Smith, 2013 “Cats are very loving creatures” Claim EV Cred EV Possible Qualifiers?

Rebuttal These are any counter-arguments or oppositions to a stated claim As a debater you should research BOTH sides of the topic so as to anticipate what your opponent(s) may say in opposition to you. Possible rebuttal to “Cats are the Best pets.”?

Argument Fallacies Bandwagon Slippery Slope False Analogy Red Herring False Cause Others?