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

Voces de cambio social (Coursera) Coursera
Laureate Education

Voces de cambio social (Coursera)

En momentos de turbulencia política, desconcierto medioambiental y permanente desigualdad social, los jóvenes creadores de cambio están liderando el camino para resolver los desafíos de la actualidad. ¿Qué está haciendo usted para crear un cambio positivo y sostenible? Voces de Cambio Social es un curso corto en línea gratuito, diseñado e impartido por ocho jóvenes emprendedores sociales.

Jun 8th 2026
5-12 Weeks
Exploring Emerging Technologies for Lifelong Learning and Success (Coursera) Coursera
University at Buffalo,The State University of New York

Exploring Emerging Technologies for Lifelong Learning and Success (Coursera)

This learning opportunity is an open-access resource for lifelong learning. The aim is to identify the value and implications of using established and emerging technology tools for personal and professional growth and acquire strategies to develop lifelong learning habits to keep pace with technology change.

Jun 1st 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.

May 25th 2026
4 Weeks
Cómo hablar bien en público (Coursera) Coursera
Universitat Autònoma de Barcelona

Cómo hablar bien en público (Coursera)

Cada día es más importante hablar bien en público. La mejor oratoria es la que permite al orador conseguir los objetivos que se había planteado. Contrariamente a la creencia común, la necesidad de una buena oratoria no es exclusiva de ciertos grupos profesionales, sino que todas las personas deberían superar el miedo escénico y hablar bien en público.

Jun 8th 2026
5-12 Weeks
Preparing for and Passing Technical Certifications (Coursera) Coursera
ROI Training

Preparing for and Passing Technical Certifications (Coursera)

Technology provides you with great opportunities for professional advancement, and technical certifications prove your knowledge, expertise, and hands-on experience to prospective employers or clients. It is extremely important to organizations like AWS, Google, Microsoft, Oracle, ITIL, PMI, and many others that their certifications prove technical expertise; otherwise, their certifications are of no value. That is why the exams are so hard. This course is intended to help you formulate an effective learning plan that will build the knowledge you need, not only to pass the exam but to be truly competent in the technology you are being tested on.

May 25th 2026
1 Week
Introduction to Psychology (Coursera) Coursera
Yale University

Introduction to Psychology (Coursera)

What are people most afraid of? What do our dreams mean? Are we natural-born racists? What makes us happy? What are the causes and cures of mental illness? This course tries to answer these questions and many others, providing a comprehensive overview of the scientific study of thought and behavior. It explores topics such as perception, communication, learning, memory, decision-making, persuasion, emotions, and social behavior. We will look at how these aspects of the mind develop in children, how they differ across people, how they are wired-up in the brain, and how they break down due to illness and injury.

Jun 8th 2026
5-12 Weeks
What does it mean to identify as Transgender or Gender Non-Conforming (TGNC)? (Coursera) Coursera
University of Minnesota

What does it mean to identify as Transgender or Gender Non-Conforming (TGNC)? (Coursera)

In the last decade transgender and gender nonconforming (TGNC) individuals have become increasingly visible in our families, culture, and public discourse. This course explores the concept of gender identity for people who are curious about the nature of gender, the process of gender affirmation, or changing social dynamics. Participants will learn the unique challenges faced by the TGNC population as well as develop the skills to build inclusive spaces in all spheres of their life. This course was developed under the Joycelyn Elders Chair for Sexual Health Education at the University of Minnesota.

May 25th 2026
5-12 Weeks
Speaking to persuade: Motivating audiences with solid arguments and moving language (Coursera) Coursera
University of Washington

Speaking to persuade: Motivating audiences with solid arguments and moving language (Coursera)

In the professional realm, we need to be able to argue without being argumentative. Whether you are fundraising for a nonprofit, pitching a business proposal, or suggesting a change to company policy, you are making arguments. In making the case for your topic, you often want to raise awareness, identify a pressing problem, discuss appropriate solutions, and outline specific steps for the audience.

Jun 1st 2026
5-12 Weeks
Finding Purpose and Meaning In Life: Living for What Matters Most (Coursera) Coursera
University of Michigan

Finding Purpose and Meaning In Life: Living for What Matters Most (Coursera)

In this course, you’ll learn how science, philosophy and practice all play a role in both finding your purpose and living a purposeful life. You will hear from historical figures and individuals about their journeys to finding and living a purposeful life, and will walk through different exercises to help you find out what matters most to you so you can live a purposeful life.

Jun 8th 2026
4 Weeks
Compreender as dimensões interculturais na vida cotidiana (Coursera) Coursera
Universidad de los Andes

Compreender as dimensões interculturais na vida cotidiana (Coursera)

Este MOOC é o resultado de uma Co construção e pesquisa por professoras da Universidad Sorbonne-Nouvelle Paris 3 e da Universidad de los Andes (Colômbia). Seu principal objetivo é fornecer ferramentas para desenvolver dimensões interculturais na vida cotidiana. O curso é destinado a estudantes e profissionais de diferentes áreas além do ensino de idiomas (humanidades e ciências sociais, educação, clínica intercultural, estudos de arte e administração) que têm que enfrentar situações da vida cotidiana e relações com outros, onde ferramentas de reflexão são necessárias para ter uma abordagem intercultural.

Jun 8th 2026
4 Weeks
Writing and Editing: Revising (Coursera) Coursera
University of Michigan

Writing and Editing: Revising (Coursera)

This fourth and final course in the “Good with Words: Writing and Editing” series will help you master perhaps the most important step in the writing process: revising. You’ll learn about the difference between editing and proofreading. You’ll practice “un-numbing the numbers” so that data and statistics you use are clear and compelling. And you’ll be introduced to a framework for giving and receiving feedback that helpfully systematizes what should be cut and what should be kept from each draft.

Jun 8th 2026
4 Weeks
Environmental Management & Ethics (Coursera) Coursera
Technical University of Denmark - DTU

Environmental Management & Ethics (Coursera)

Decision-makers often turn to scientists and engineers to assist them to navigate through complex environmental, health and societal challenges pervaded by systemic uncertainty, ambiguity and ethical implications. This course prepares you to meet the requests and demands of current and future decision-makers and in this course, you will analyze ethical challenges associated with environmental dilemmas and apply different decision making tools relevant to environmental management and regulation.

Jun 8th 2026
5-12 Weeks