Think Again IV: How to Avoid Fallacies (Coursera)

Offered by Duke University,
Think Again IV: How to Avoid Fallacies (Coursera)

We encounter fallacies almost everywhere we look. Politicians, salespeople, and children commonly use fallacies in order to get you to think whatever they want you to think. It’s important to learn to recognize fallacies so that you can avoid being fooled by them. It’s also important to learn about fallacies so that you avoid making fallacious arguments yourself. This course will show you how to identify and avoid many of the fallacies that lead people astray. In this course, you will learn about fallacies. Fallacies are arguments that suffer from one or more common but avoidable defects: equivocation, circularity, vagueness, etc. It’s important to learn about fallacies so that you can recognize them when you see them, and not be fooled by them. It’s also important to learn about fallacies so that you avoid making fallacious arguments yourself.

Class Deals by MOOC List - Click here and see Coursera's Active Discounts, Deals, and Promo Codes.

Suggested Readings:
Students who want more detailed explanations or additional exercises or who want to explore these topics in more depth should consult Understanding Arguments: An Introduction to Informal Logic, Ninth Edition, Concise, Chapters 13-17, by Walter Sinnott-Armstrong and Robert Fogelin.
Course Format
Each week will be divided into multiple video segments that can be viewed separately or in groups. There will be short ungraded quizzes after each segment (to check comprehension) and a longer graded quiz at the end of the course.
Course 4 of 4 in the Introduction to Logic and Critical Thinking Specialization.

Syllabus

WEEK 1
Welcome to the Course
Welcome to Think Again: How to Avoid Fallacies! This course is the fourth in the specialization Introduction to Logic and Critical Thinking, based on our original Coursera course titled Think Again: How to Reason and Argue. We are excited that you are taking this course, and we hope that you will take all four courses in the series, because there is a great deal of important material to learn. In the series as a whole, you learn how to analyze and evaluate arguments and how to avoid common mistakes in reasoning. These important skills will be useful to you in deciding what to believe and what to do in all areas of your life. We encounter fallacies almost everywhere we look. Politicians, salespeople, and children commonly use fallacies in order to get us to think what they want us to think. Think Again: How to Avoid Fallacies will show how to identify and avoid many of the fallacies that people use to get us to think the way they want us to think. The first part of this course introduces the series and the course. It also clarifies some peculiarities you may find with this course. We encourage you to watch the "Introduction to the Specialization" video first as it will help you learn more from the materials that come later.
Fallacies of Unclarity
CONTENT: In this week's material we will describes two phenomena that are both common and useful in the languages that human beings speak, but both of which give rise to the potential for fallacious reasoning. A word or phrase is vague when its meaning is not precise, and it is ambiguous when it has more than one meaning. When we use vague or ambiguous phrases in our reasoning, it is very easy for us to make a number of different kinds of fallacies. This week will teach you what these different kinds of fallacies are, and give us some practice in spotting them, so you can make sure to avoid them in the future. LEARNING OUTCOMES : By the end of this week's material you will be able to: define what a fallacy is distinguish various kinds of fallacies understand the linguistic phenomena that give rise to fallacies identify various kinds of slippery slop fallacies where they occur identify various kinds of fallacies of equivocation where they occur OPTIONAL READING: If you want more examples or more detailed discussions of the fallacies that result from vaguness or ambiguity, we recommend Understanding Arguments, Ninth Edition, Chapters 13-14.

WEEK 2
CONTENT: This week describes two of the most common fallacies that people make: ad hominem fallacies and appeals to authority. Part of what makes these fallacies so common, and so difficult to avoid, is that many ad hominem arguments, and many appeals to authority, are actually not fallacies at all! Only some of them are. And figuring out which of them are fallacies is more of an art than a science. There is no simple recipe, but there are some rules of thumb you can use. We hope that the practice that you get in this week will help you to improve your skills at distinguish the fallacious from the non-fallacious instances of ad hominem reasoning, as well as appeal to authority. LEARNING OUTCOMES: By the end of this section you will be able to: determine whether an ad hominem argument is a fallacy determine whether an appeal to authority is a fallacy OPTIONAL READING: If you want more examples or more detailed discussions of these topics, we recommend Understanding Arguments, Ninth Edition, Chapter 15.
Fallacies of Vacuity and Circularity
CONTENT: Now we will describe another common set of fallacies: fallacies that occur when an argument makes no progress from its premises to its conclusion. Sometimes, arguments make no progress because the conclusion is already contained in the premises. Sometimes, arguments make no progress because the conclusion is presupposed by the premises. And sometimes, arguments make no progress because the premises don’t make any claim at all, even if they might sound like they do. When you know how to identify such fallacies, you will find that they are more common than you think! LEARNING OUTCOMES: By the end of this section you will be able to: identify various kinds of circularity or vacuity where they occur OPTIONAL READING: If you want more examples or more detailed discussions of these topics, we recommend Understanding Arguments,Ninth Edition, Chapter 16.

WEEK 3
Refutation: Its Varieties and PItfalls
CONTENT: This week we will teach you various strategies for refuting a fallacious argument. To refute an argument is to show that the argument is unsuccessful. Even if you are able to identify a fallacious argument as a fallacy, you might still not be able to prove to others that it is a fallacy. In this week, you will learn a variety of techniques for proving to others that the argument is a fallacy. LEARNING OUTCOMES: By the end of this week you will be able to: refute fallacious arguments OPTIONAL READING: If you want more examples or more detailed discussions of these topics, we recommend Understanding Arguments, Ninth Edition, Chapter 17.

WEEK 4
Catch-Up and Final Quiz
This week gives you time to catch up and review, because we realize that the previous weeks include a great deal of challenging material. It will also be provide enough time to take the final quiz as often as you want, with different questions each time. We explain the answers in each exam so that you can learn more and do better when you try the exam again. You may take the quiz as many times as you want in order to learn more and do better, with different questions each time. You will be able to retake the quiz three times every eight hours. You might not need to take more than one version of the exam if you do well enough on your first try. That is up to you. However many versions you take, we hope that all of the exams will provide additional learning experiences.

Go to Class
MOOC List is learner-supported. When you buy through links on our site, we may earn an affiliate commission.

Related Courses

Autoliderazgo y gestión de emociones para avanzar en desafíos complejos (Coursera) Coursera
Universidad de los Andes

Autoliderazgo y gestión de emociones para avanzar en desafíos complejos (Coursera)

"Autoliderazgo y Gestión de Emociones para Avanzar en Desafíos Complejos" es un curso práctico, enfocado en tu primer círculo de influencia: tú mismo. El curso te invitará a conectarte con tus propósitos e identificar la forma en la que tus creencias, miedos y hambres con frecuencia dificultan el logro de tus propósitos y tu avance en desafíos de liderazgo. El curso te va a permitir identificar, y si lo decides, trabajar temas personales que te ayudarán a ser más efectivo y a acercarte más a vivir tu vida como quieres vivirla.

Jun 23rd 2026
4 Weeks
The Science of Generosity: Do Good...Feel Good (Coursera) Coursera
University of Pennsylvania

The Science of Generosity: Do Good...Feel Good (Coursera)

What does it mean to be generous? Can doing good actually make you feel good? In this course, we’ll hear from multiple experts and explore the many facets of generosity by looking closely at the meanings, traits, and motivations behind giving behaviors across communities and cultures. We’ll discuss how generosity contributes to our own happiness and well-being as well as the happiness and well-being of our loved ones, our local communities, and our global society.

Jun 15th 2026
4 Weeks
Try RRI! A guide for Responsible Research and Innovation (Coursera) Coursera
University of Amsterdam

Try RRI! A guide for Responsible Research and Innovation (Coursera)

In this online course you will learn how to apply Responsible Research and Innovation (RRI) in your own work. First by understanding why it is important to act responsibly in your research and innovation processes at all. In a second step, you will get introduced to several tools that will help make your own work in research and/or innovation more aware by introducing concepts of RRI.

Jun 22nd 2026
3 Weeks
Brilliant, Passionate You (Coursera) Coursera
University of Michigan

Brilliant, Passionate You (Coursera)

This course is an interdisciplinary look at how we can make each day the best day of our lives by examining the question, “How can you be your most brilliant, passionate self?” You will be joined on this journey by our animated host, Lewis! You will envision your “perfect day” and then slowly deconstruct the elements of that day to better understand key elements such as finding your purpose, defining success, mental and physical health, the importance of community, and navigating risks and challenges. In addition, you will hear stories from a diverse array of individuals, including students, doctors, teachers, professional storytellers, professional athletes, coaches, and others sharing their own journeys, communities, and sources of inspiration.

Jun 15th 2026
5-12 Weeks
International Travel Preparation, Safety, & Wellness (Coursera) Coursera
Johns Hopkins University

International Travel Preparation, Safety, & Wellness (Coursera)

Whether you've traveled before or not, living and working overseas can be challenging. Learn how best to prepare and make the most of your time internationally. This course will prepare you to work and live overseas. It explores the epidemiology of common morbidity and mortality among travelers and examines key prevention, safety, and travel medicine principles and services to contextualize risks and maintain wellness.

Jun 22nd 2026
4 Weeks
Career Planning: A Pathway to Employment (Coursera) Coursera
University System of Georgia

Career Planning: A Pathway to Employment (Coursera)

This course is designed to foster creative approaches to launching a new career. You will articulate best ways to make a first impression and analyze your strengths by creating a personal statement. You will identify appropriate elements to make your resume stand out from the crowd. You will also identify the most effective ways a cover letter can answer a job description, and how to best leverage social media in your job search.

Jun 15th 2026
5-12 Weeks
Tinkering Fundamentals: Motion and Mechanisms (Coursera) Coursera
Exploratorium

Tinkering Fundamentals: Motion and Mechanisms (Coursera)

The Tinkering Fundamentals course will offer educators and enthusiasts an opportunity to develop a practice of tinkering and making. We see tinkering as a serious endeavor—one that is generalizable across content and especially good at interweaving disciplines in a way that leads to complex projects and individualized learning opportunities.

Jun 22nd 2026
5-12 Weeks
Think Again II: How to Reason Deductively (Coursera) Coursera
Duke University

Think Again II: How to Reason Deductively (Coursera)

Deductive arguments are supposed to be valid in the sense that the premises guarantee that the conclusion is true. In this course, you will learn how to use truth-tables and Venn diagrams to represent the information contained in the premises and conclusion of an argument so that you can determine whether or not the argument is deductively valid.

Jun 22nd 2026
4 Weeks
Speaking to Inspire: Ceremonial and Motivational Speeches (Coursera) Coursera
University of Washington

Speaking to Inspire: Ceremonial and Motivational Speeches (Coursera)

The most memorable speeches inspire, entertain, and praise. By blending stories and eloquence, great speeches highlight the core values motivating an audience. You might need to do this in a keynote address, a eulogy, or simply a business meeting. Inspiring audiences is a common, but difficult writing challenge. You want a speech that elevates the topic and the audience.

Jun 23rd 2026
5-12 Weeks