When Reviewing the Conclusion You Must Make Sure the Recommendations Are Complete

What this handout is near

This handout discusses common logical fallacies that you may run into in your own writing or the writing of others. The handout provides definitions, examples, and tips on fugitive these fallacies.

Arguments

Most bookish writing tasks require you lot to make an argument—that is, to present reasons for a item claim or interpretation you are putting forrad. You may have been told that you demand to make your arguments more than logical or stronger. And you may have worried that you simply aren't a logical person or wondered what it ways for an argument to be stiff. Learning to brand the all-time arguments yous tin can is an ongoing process, but it isn't impossible: "Being logical" is something anyone tin can do, with exercise.

Each argument you make is composed of bounds (this is a term for statements that express your reasons or evidence) that are arranged in the right way to support your conclusion (the main claim or interpretation y'all are offer). You can brand your arguments stronger past:

using practiced premises (ones you accept good reason to believe are both true and relevant to the issue at manus),
making certain your premises provide practiced back up for your conclusion (and not another determination, or no conclusion at all),
checking that you take addressed the well-nigh important or relevant aspects of the issue (that is, that your bounds and conclusion focus on what is really important to the issue), and
not making claims that are so strong or sweeping that you can't really support them.

You also need to be certain that y'all present all of your ideas in an orderly fashion that readers tin can follow. Run across our handouts on argument and organization for some tips that will amend your arguments.

This handout describes some ways in which arguments ofttimes fail to do the things listed above; these failings are called fallacies. If you're having trouble developing your argument, cheque to run across if a fallacy is part of the problem.

It is peculiarly easy to slip upwards and commit a fallacy when you have strong feelings about your topic—if a determination seems obvious to you, you lot're more likely to just assume that information technology is true and to be careless with your evidence. To assistance you see how people normally make this mistake, this handout uses a number of controversial political examples—arguments about subjects like abortion, gun control, the death penalisation, gay marriage, euthanasia, and pornography. The purpose of this handout, though, is non to argue for whatever particular position on any of these issues; rather, it is to illustrate weak reasoning, which can happen in pretty much any kind of argument. Please be aware that the claims in these examples are just made-upwards illustrations—they haven't been researched, and you shouldn't utilize them as evidence in your own writing.

What are fallacies?

Fallacies are defects that weaken arguments. By learning to look for them in your own and others' writing, you can strengthen your ability to evaluate the arguments you make, read, and hear. Information technology is of import to realize two things virtually fallacies: first, beguiling arguments are very, very mutual and can be quite persuasive, at least to the coincidental reader or listener. You can find dozens of examples of beguiling reasoning in newspapers, advertisements, and other sources. Second, information technology is sometimes hard to evaluate whether an argument is beguiling. An statement might be very weak, somewhat weak, somewhat stiff, or very potent. An statement that has several stages or parts might have some strong sections and some weak ones. The goal of this handout, then, is non to teach you how to label arguments as fallacious or fallacy-free, but to help you look critically at your ain arguments and move them abroad from the "weak" and toward the "strong" end of the continuum.

So what do fallacies wait similar?

For each fallacy listed, at that place is a definition or explanation, an example, and a tip on how to avoid committing the fallacy in your own arguments.

Jerky generalization

Definition: Making assumptions about a whole group or range of cases based on a sample that is inadequate (usually considering it is atypical or also minor). Stereotypes about people ("librarians are shy and smart," "wealthy people are snobs," etc.) are a common instance of the principle underlying hasty generalization.

Instance: "My roommate said her philosophy grade was hard, and the one I'm in is hard, as well. All philosophy classes must be hard!" Two people's experiences are, in this case, non enough on which to base of operations a conclusion.

Tip: Ask yourself what kind of "sample" you lot're using: Are yous relying on the opinions or experiences of just a few people, or your own experience in simply a few situations? If so, consider whether you need more evidence, or maybe a less sweeping conclusion. (Notice that in the example, the more than modest decision "Some philosophy classes are difficult for some students" would non be a hasty generalization.)

Missing the betoken

Definition: The premises of an argument do back up a detail conclusion—only non the conclusion that the arguer actually draws.

Example: "The seriousness of a punishment should lucifer the seriousness of the crime. Right now, the punishment for drunk driving may just be a fine. But drunk driving is a very serious crime that tin kill innocent people. So the death penalty should be the punishment for drunk driving." The argument actually supports several conclusions—"The penalization for drunk driving should be very serious," in particular—but it doesn't support the merits that the death penalty, specifically, is warranted.

Tip: Split your premises from your decision. Looking at the premises, ask yourself what conclusion an objective person would reach after reading them. Looking at your conclusion, ask yourself what kind of evidence would be required to support such a determination, and and then run across if you've really given that evidence. Missing the betoken often occurs when a sweeping or extreme conclusion is being fatigued, so exist peculiarly conscientious if y'all know you lot're claiming something large.

Mail hoc (as well called faux cause)

This fallacy gets its proper name from the Latin phrase "post hoc, ergo propter hoc," which translates as "after this, therefore because of this."

Definition: Assuming that considering B comes afterwards A, A caused B. Of class, sometimes one event really does cause another i that comes later—for example, if I register for a class, and my proper name later appears on the roll, information technology'south true that the first event caused the one that came later. But sometimes two events that seem related in fourth dimension aren't really related as cause and event. That is, correlation isn't the same matter as causation.

Examples: "President Jones raised taxes, and and so the charge per unit of violent crime went up. Jones is responsible for the ascension in criminal offence." The increase in taxes might or might non be 1 factor in the ascent criminal offense rates, just the statement hasn't shown us that i caused the other.

Tip: To avoid the post hoc fallacy, the arguer would need to give us some explanation of the process by which the revenue enhancement increase is supposed to have produced higher crime rates. And that's what you should practise to avoid committing this fallacy: If you say that A causes B, you lot should have something more to say about how A caused B than simply that A came start and B came later on.

Glace slope

Definition: The arguer claims that a sort of chain reaction, commonly catastrophe in some dire consequence, will take place, but there's really not plenty evidence for that assumption. The arguer asserts that if we have even i step onto the "slippery slope," we volition end upwards sliding all the way to the bottom; he or she assumes we tin't cease partway downward the colina.

Instance: "Animal experimentation reduces our respect for life. If we don't respect life, we are likely to be more and more tolerant of fierce acts like war and murder. Shortly our social club volition become a battlefield in which everyone constantly fears for their lives. It will exist the terminate of culture. To prevent this terrible consequence, nosotros should make brute experimentation illegal right now." Since animal experimentation has been legal for some fourth dimension and culture has not yet ended, it seems peculiarly articulate that this concatenation of events won't necessarily have place. Even if we believe that experimenting on animals reduces respect for life, and loss of respect for life makes us more tolerant of violence, that may be the spot on the hillside at which things stop—we may not slide all the way downward to the stop of civilization. And then we have not yet been given sufficient reason to have the arguer's decision that we must brand animate being experimentation illegal right now.

Like post hoc, slippery slope can be a tricky fallacy to identify, since sometimes a chain of events really can be predicted to follow from a certain action. Here's an example that doesn't seem fallacious: "If I fail English language 101, I won't be able to graduate. If I don't graduate, I probably won't be able to get a good chore, and I may very well finish up doing temp work or flipping burgers for the next year."

Tip: Check your statement for chains of consequences, where you say "if A, then B, and if B, and so C," and so forth. Make sure these bondage are reasonable.

Weak analogy

Definition: Many arguments rely on an analogy between two or more than objects, ideas, or situations. If the two things that are existence compared aren't really alike in the relevant respects, the analogy is a weak i, and the argument that relies on it commits the fallacy of weak analogy.

Example: "Guns are like hammers—they're both tools with metal parts that could be used to kill someone. And yet it would be ridiculous to restrict the purchase of hammers—and then restrictions on purchasing guns are as ridiculous." While guns and hammers do share certain features, these features (having metal parts, beingness tools, and being potentially useful for violence) are non the ones at stake in deciding whether to restrict guns. Rather, we restrict guns because they can easily exist used to kill large numbers of people at a distance. This is a feature hammers do not share—it would be hard to impale a crowd with a hammer. Thus, the illustration is weak, and then is the argument based on it.

If yous think about it, you tin make an analogy of some kind between near any two things in the earth: "My paper is similar a mud puddle because they both get bigger when it rains (I piece of work more when I'm stuck inside) and they're both kind of murky." So the mere fact that you can draw an illustration between two things doesn't bear witness much, by itself.

Arguments by analogy are often used in discussing abortion—arguers frequently compare fetuses with adult man beings, and so argue that handling that would violate the rights of an adult human being as well violates the rights of fetuses. Whether these arguments are proficient or not depends on the forcefulness of the analogy: do adult humans and fetuses share the properties that give adult humans rights? If the property that matters is having a human genetic code or the potential for a life full of human experiences, adult humans and fetuses exercise share that property, then the argument and the illustration are strong; if the property is being self-aware, rational, or able to survive on i'due south own, adult humans and fetuses don't share it, and the analogy is weak.

Tip: Place what properties are important to the claim you're making, and run into whether the 2 things you're comparing both share those properties.

Appeal to say-so

Definition: Frequently we add strength to our arguments past referring to respected sources or authorities and explaining their positions on the issues we're discussing. If, however, nosotros try to get readers to agree with us simply by impressing them with a famous name or by appealing to a supposed authorization who really isn't much of an adept, we commit the fallacy of appeal to potency.

Example: "Nosotros should abolish the death penalty. Many respected people, such as player Guy Handsome, have publicly stated their opposition to information technology." While Guy Handsome may be an say-so on matters having to do with acting, there's no particular reason why anyone should be moved by his political opinions—he is probably no more of an authority on the death sentence than the person writing the newspaper.

Tip: There are ii easy ways to avoid committing appeal to say-so: Start, make sure that the authorities you cite are experts on the subject you're discussing. Second, rather than just saying "Dr. Say-so believes 10, so nosotros should believe information technology, too," endeavor to explain the reasoning or testify that the say-so used to get in at his or her opinion. That way, your readers have more than to become on than a person's reputation. Information technology as well helps to choose regime who are perceived as fairly neutral or reasonable, rather than people who will be perceived as biased.

Ad populum

Definition: The Latin name of this fallacy means "to the people." There are several versions of the advertizing populum fallacy, merely in all of them, the arguer takes reward of the desire most people have to exist liked and to fit in with others and uses that want to try to go the audience to accept his or her argument. One of the most common versions is the bandwagon fallacy, in which the arguer tries to convince the audience to exercise or believe something because everyone else (supposedly) does.

Example: "Gay marriages are just immoral. lxx% of Americans think and then!" While the opinion of most Americans might be relevant in determining what laws we should take, it certainly doesn't decide what is moral or immoral: there was a fourth dimension where a substantial number of Americans were in favor of segregation, but their opinion was non testify that segregation was moral. The arguer is trying to go us to hold with the conclusion by appealing to our want to fit in with other Americans.

Tip: Make sure that you aren't recommending that your readers believe your conclusion because everyone else believes it, all the absurd people believe it, people will like you ameliorate if you believe it, and so forth. Go on in listen that the popular stance is non e'er the correct one.

Advert hominem and tu quoque

Definitions: Like the entreatment to authority and ad populum fallacies, the ad hominem ("against the person") and tu quoque ("yous, too!") fallacies focus our attention on people rather than on arguments or evidence. In both of these arguments, the conclusion is usually "You shouldn't believe So-and-And then's argument." The reason for not assertive So-and-So is that Then-and-So is either a bad person (ad hominem) or a hypocrite (tu quoque). In an ad hominem argument, the arguer attacks his or her opponent instead of the opponent's statement.

Examples: "Andrea Dworkin has written several books arguing that pornography harms women. But Dworkin is merely ugly and biting, then why should nosotros heed to her?" Dworkin's advent and grapheme, which the arguer has characterized so ungenerously, accept nothing to practice with the strength of her argument, and then using them equally bear witness is fallacious.

In a tu quoque argument, the arguer points out that the opponent has really done the matter he or she is arguing confronting, and then the opponent's argument shouldn't be listened to. Hither's an example: imagine that your parents have explained to you lot why y'all shouldn't smoke, and they've given a lot of good reasons—the harm to your health, the price, and and then along. You reply, "I won't accept your argument, because you used to fume when you were my historic period. Yous did it, likewise!" The fact that your parents accept done the thing they are condemning has no bearing on the premises they put forward in their argument (smoking harms your health and is very expensive), then your response is beguiling.

Tip: Be certain to stay focused on your opponents' reasoning, rather than on their personal character. (The exception to this is, of class, if y'all are making an argument nearly someone's character—if your conclusion is "President Jones is an untrustworthy person," bounds about her untrustworthy acts are relevant, not fallacious.)

Entreatment to pity

Definition: The appeal to compassion takes place when an arguer tries to go people to have a decision by making them feel sorry for someone.

Examples: "I know the exam is graded based on functioning, only y'all should give me an A. My cat has been ill, my auto bankrupt down, and I've had a cold, and then it was really difficult for me to report!" The decision here is "Yous should requite me an A." Just the criteria for getting an A have to do with learning and applying the material from the form; the principle the arguer wants u.s. to accept (people who have a hard week deserve A'south) is clearly unacceptable. The information the arguer has given might feel relevant and might even become the audience to consider the decision—but the data isn't logically relevant, then the argument is beguiling. Here'southward another example: "It'due south wrong to taxation corporations—call up of all the money they give to charity, and of the costs they already pay to run their businesses!"

Tip: Make certain that you aren't simply trying to get your audience to agree with you lot by making them feel sorry for someone.

Appeal to ignorance

Definition: In the appeal to ignorance, the arguer basically says, "Look, at that place'due south no conclusive evidence on the issue at hand. Therefore, y'all should accept my decision on this issue."

Example: "People take been trying for centuries to prove that God exists. But no one has yet been able to prove information technology. Therefore, God does non exist." Here's an opposing argument that commits the same fallacy: "People take been trying for years to evidence that God does not exist. Simply no one has yet been able to testify information technology. Therefore, God exists." In each case, the arguer tries to use the lack of evidence as support for a positive claim nigh the truth of a conclusion. There is one state of affairs in which doing this is not fallacious: if qualified researchers have used well-thought-out methods to search for something for a long time, they oasis't establish it, and it's the kind of matter people ought to be able to find, then the fact that they haven't found it constitutes some evidence that information technology doesn't exist.

Tip: Look closely at arguments where y'all point out a lack of testify and then describe a determination from that lack of evidence.

Straw man

Definition: One manner of making our own arguments stronger is to anticipate and respond in advance to the arguments that an opponent might make. In the straw man fallacy, the arguer sets up a weak version of the opponent'southward position and tries to score points by knocking information technology down. But just every bit being able to knock down a straw human being (like a scarecrow) isn't very impressive, defeating a watered-down version of your opponent's argument isn't very impressive either.

Example: "Feminists want to ban all pornography and punish everyone who looks at it! But such harsh measures are surely inappropriate, so the feminists are wrong: porn and its fans should be left in peace." The feminist argument is made weak past being overstated. In fact, most feminists practice not advise an outright "ban" on porn or any penalisation for those who but view it or approve of it; oftentimes, they advise some restrictions on detail things like child porn, or advise to allow people who are hurt by porn to sue publishers and producers—non viewers—for damages. And so the arguer hasn't really scored whatsoever points; he or she has just committed a fallacy.

Tip: Exist charitable to your opponents. Land their arguments as strongly, accurately, and sympathetically every bit possible. If you tin can knock down fifty-fifty the best version of an opponent's argument, then you've really accomplished something.

Red herring

Definition: Partway through an argument, the arguer goes off on a tangent, raising a side issue that distracts the audience from what'southward really at pale. Often, the arguer never returns to the original issue.

Example: "Grading this test on a curve would be the virtually fair matter to do. After all, classes go more smoothly when the students and the professor are getting along well." Let'due south attempt our premise-conclusion outlining to see what'southward incorrect with this statement:

Premise: Classes get more smoothly when the students and the professor are getting along well.

Conclusion: Grading this exam on a curve would exist the most fair affair to do.

When we lay it out this way, information technology's pretty obvious that the arguer went off on a tangent—the fact that something helps people go along doesn't necessarily make it more fair; fairness and justice sometimes crave the states to do things that cause conflict. But the audience may experience similar the issue of teachers and students agreeing is important and be distracted from the fact that the arguer has not given whatsoever testify as to why a bend would be fair.

Tip: Endeavour laying your premises and conclusion out in an outline-similar form. How many issues do y'all see being raised in your statement? Can you explain how each premise supports the conclusion?

Imitation dichotomy

Definition: In false dichotomy, the arguer sets up the situation and then it looks like in that location are only two choices. The arguer then eliminates 1 of the choices, so information technology seems that we are left with just ane option: the one the arguer wanted us to pick in the first place. Only frequently there are really many dissimilar options, not only two—and if we thought about them all, we might not exist so quick to pick the one the arguer recommends.

Example: "Caldwell Hall is in bad shape. Either we tear it down and put upwardly a new building, or we continue to run a risk students' rubber. Obviously we shouldn't take a chance anyone's safety, so we must tear the edifice downward." The argument neglects to mention the possibility that nosotros might repair the building or find some style to protect students from the risks in question—for instance, if only a few rooms are in bad shape, possibly we shouldn't hold classes in those rooms.

Tip: Examine your ain arguments: if you're maxim that we have to choose betwixt just two options, is that really so? Or are there other alternatives yous oasis't mentioned? If there are other alternatives, don't just ignore them—explain why they, too, should be ruled out. Although in that location'due south no formal proper name for information technology, assuming that there are only iii options, four options, etc. when actually there are more is like to false dichotomy and should also be avoided.

Begging the question

Definition: A complicated fallacy; it comes in several forms and can be harder to discover than many of the other fallacies we've discussed. Basically, an argument that begs the question asks the reader to simply accept the determination without providing real bear witness; the argument either relies on a premise that says the same matter as the conclusion (which you might hear referred to as "being round" or "circular reasoning"), or simply ignores an important (but questionable) assumption that the argument rests on. Sometimes people use the phrase "beg the question" as a sort of general criticism of arguments, to mean that an arguer hasn't given very good reasons for a conclusion, but that'due south not the meaning we're going to talk over here.

Examples: "Active euthanasia is morally acceptable. It is a decent, ethical thing to assist another homo escape suffering through death." Let'due south lay this out in premise-conclusion form:

Premise: It is a decent, ethical matter to help another human being escape suffering through expiry.

Conclusion: Active euthanasia is morally acceptable.

If we "translate" the premise, nosotros'll see that the arguer has really just said the same matter twice: "decent, upstanding" ways pretty much the same affair equally "morally adequate," and "help another man escape suffering through expiry" means something pretty similar to "active euthanasia." So the premise basically says, "active euthanasia is morally acceptable," simply like the conclusion does. The arguer hasn't yet given us any real reasons why euthanasia is acceptable; instead, she has left u.s.a. asking "well, really, why do y'all think active euthanasia is acceptable?" Her statement "begs" (that is, evades) the real question.

Hither's a second example of begging the question, in which a dubious premise which is needed to make the statement valid is completely ignored: "Murder is morally wrong. So active euthanasia is morally wrong." The premise that gets left out is "active euthanasia is murder." And that is a debatable premise—again, the statement "begs" or evades the question of whether active euthanasia is murder by simply not stating the premise. The arguer is hoping we'll simply focus on the uncontroversial premise, "Murder is morally wrong," and non notice what is being causeless.

Tip: One way to try to avoid begging the question is to write out your premises and determination in a short, outline-like form. Meet if you find any gaps, any steps that are required to movement from one premise to the next or from the premises to the conclusion. Write down the statements that would fill those gaps. If the statements are controversial and yous've just glossed over them, you might be begging the question. Next, check to see whether any of your premises basically says the same thing as the conclusion (only in different words). If so, yous're probably begging the question. The moral of the story: yous can't just assume or utilize equally uncontroversial evidence the very thing you're trying to evidence.

Equivocation

Definition: Equivocation is sliding between two or more different meanings of a unmarried word or phrase that is important to the argument.

Instance: "Giving money to clemency is the correct thing to exercise. Then charities have a right to our money." The equivocation here is on the word "right": "right" can mean both something that is correct or proficient (as in "I got the right answers on the exam") and something to which someone has a merits (as in "everyone has a right to life"). Sometimes an arguer volition deliberately, sneakily equivocate, often on words like "freedom," "justice," "rights," so along; other times, the equivocation is a fault or misunderstanding. Either way, it's important that you use the main terms of your argument consistently.

Tip: Place the most important words and phrases in your argument and ask yourself whether they could accept more than one meaning. If they could, be sure you aren't slipping and sliding between those meanings.

So how do I observe fallacies in my ain writing?

Here are some general tips for finding fallacies in your own arguments:

Pretend you disagree with the decision you lot're defending. What parts of the statement would at present seem fishy to you? What parts would seem easiest to assault? Requite special attending to strengthening those parts.
List your main points; under each ane, list the evidence you have for it. Seeing your claims and bear witness laid out this way may make you realize that you have no proficient prove for a particular claim, or it may help you wait more critically at the prove you lot're using.
Learn which types of fallacies y'all're specially decumbent to, and exist careful to check for them in your work. Some writers brand lots of appeals to authority; others are more than likely to rely on weak analogies or ready straw men. Read over some of your old papers to see if there'due south a item kind of fallacy yous demand to watch out for.
Exist aware that broad claims need more proof than narrow ones. Claims that use sweeping words similar "all," "no," "none," "every," "always," "never," "no one," and "anybody" are sometimes appropriate—but they require a lot more than proof than less-sweeping claims that use words like "some," "many," "few," "sometimes," "usually," and so forth.
Double bank check your characterizations of others, especially your opponents, to be certain they are accurate and fair.

Tin can I get some do with this?

Yes, y'all can. Follow this link to see a sample argument that's total of fallacies (and then you lot can follow another link to get an explanation of each one). And then there's a more than well-constructed argument on the same topic.

Works consulted

Nosotros consulted these works while writing this handout. This is not a comprehensive list of resource on the handout's topic, and we encourage yous to exercise your own research to notice additional publications. Delight do not use this list as a model for the format of your own reference listing, equally information technology may non match the citation style you are using. For guidance on formatting citations, please see the UNC Libraries citation tutorial. Nosotros revise these tips periodically and welcome feedback.

Copi, Irving M., Carl Cohen, and Victor Rodych. 1998. Introduction to Logic. London: Pearson Didactics.

Hurley, Patrick J. 2000. A Curtailed Introduction to Logic, 7th ed. Belmont, CA: Wadsworth.

Lunsford, Andrea A., and John J. Ruszkiewicz. 2016. Everything's an Argument, 7th ed. Boston: Bedford/St Martin's.

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