Faulty logic is one reason why groups make defective decisions. In long discussions, spanning many meetings, email messages and other postings, a chain of logic emerges. Usually, the chain is valid and coherent, but when the conversation becomes complex, when the stakes are high, or when time is short, a group can make logical errors. Here's a small collection.
- The fallacy fallacy
- If the argument used to reach our conclusions is later found to be flawed, we sometimes believe that the conclusion produced by that argument must also be false.
- Not so. That we reached a particular conclusion by faulty logic doesn't mean that the conclusion itself is false. The conclusion might be true, or it might be false.
- Sand castle fallacy
- If the argument is founded on premises that later prove to be false, or partly false, we sometimes believe that the conclusion produced by that argument must also be false.
- Not so. That we reached a particular conclusion based on faulty premises doesn't mean that the conclusion is false. We might have built a castle on sand, but it might still be a castle. If we can find a better foundation for that castle, it might yet prove durable.
- Affirming a disjunct
- If we know that A or B is true, and it turns out that A is true, we sometimes conclude that B must be false.
- The fallacy here arises in instances when A and B are both true. In informal conversation, we often use "or" in the exclusive sense: either A or B, but not both. But in many situations, "or" actually is valid in the inclusive sense: A or B or possibly both A and B.
- Affirming the consequent
- When a conversation becomes
complex, when the stakes
are high, or when time
is short, a group can
make logical errors
- In this error, sometimes called the converse error, we conclude incorrectly that a premise must be true if the conclusion is true. That is, when we know that P implies Q, and we know that Q holds, we wrongly conclude that P must also be true.
- The problem here is that the converse of a true statement isn't necessarily true. The contrapositive is true, though: if not Q then not P.
- Denying the antecedent
- This formal fallacy, sometimes also called the inverse error, is committed when we know that if P, then Q. If we later find that P is false, we then sometimes conclude erroneously that Q is false.
- All we can say for sure is that Q might be false when P is false; Q might also be true.
Keeping these errors and their names straight can be difficult, but learning to recognize and avoid them is certainly easier. There is a trap, though. Once you notice that a group has committed one of these errors, remember that it's often possible that their conclusion is correct. To forget that possibility is to commit the fallacy fallacy. Top Next Issue
Are you fed up with tense, explosive meetings? Are you or a colleague the target of a bully? Destructive conflict can ruin organizations. But if we believe that all conflict is destructive, and that we can somehow eliminate conflict, or that conflict is an enemy of productivity, then we're in conflict with Conflict itself. Read 101 Tips for Managing Conflict to learn how to make peace with conflict and make it an organizational asset. Order Now!
Your comments are welcomeWould you like to see your comments posted here? rbrenzcQZIMnLqHrQCfQsner@ChacDLesZFszQpZKHrJmoCanyon.comSend me your comments by email, or by Web form.
About Point Lookout
Thank you for reading this article. I hope you enjoyed it and found it useful, and that you'll consider recommending it to a friend.
Support Point Lookout by joining the Friends of Point Lookout, as an individual or as an organization.
Do you face a complex interpersonal situation? Send it in, anonymously if you like, and I'll give you my two cents.
More articles on Personal, Team, and Organizational Effectiveness:
- Inner Babble
- It goes by various names — self-talk, inner dialog, or internal conversation. Because it is so
often disorganized and illogical, I like to call it inner babble. But whatever you call it, it's
often misleading, distracting, and unhelpful. How can you recognize inner babble?
- Organizing a Barn Raising
- Once you find a task that you can tackle as a "barn raising," your work is just beginning.
Planning and organizing the work is in many ways the hard part.
- Pet Peeves About Work
- Everybody has pet peeves about work. Here's a collection drawn from my own life, the lives of others,
and my vivid imagination.
- Risk Management Risk: I
- Risk Management Risk is the risk that a particular risk management plan is deficient. It's often overlooked,
and therefore often unmitigated. We can reduce this risk by applying some simple procedures.
- Be With the Real
- When the stream of unimportant events and concerns reaches a high enough tempo, we can become so transfixed
that we lose awareness of the real and the important. Here are some suggestions for being with the Real.
Forthcoming issues of Point Lookout
- Coming June 20: Managing Dissent Risk
- In group decision making, dissent risk is the risk that dissents about important decisions will be rejected without due consideration. As a result, group decision quality can suffer, and some groups will actually eject dissenters. How can we manage dissent risk? Available here and by RSS on June 20.
- And on June 27: Interrupting Others in Meetings Safely: I
- In meetings we sometimes feel the need to interrupt others to offer a view or information, or to suggest adjusting the process. But such interruptions carry risk of offense. How can we interrupt others safely? Available here and by RSS on June 27.
I offer email and telephone coaching at both corporate and individual rates. Contact Rick for details at rbrenBbVClwwGNhHPDAJhner@ChachANSATIFVYPGFYNnoCanyon.com or (650) 787-6475, or toll-free in the continental US at (866) 378-5470.
Get the ebook!
Past issues of Point Lookout are available in six ebooks:
- Get 2001-2 in Geese Don't Land on Twigs (PDF, USD 11.95)
- Get 2003-4 in Why Dogs Wag (PDF, USD 11.95)
- Get 2005-6 in Loopy Things We Do (PDF, USD 11.95)
- Get 2007-8 in Things We Believe That Maybe Aren't So True (PDF, USD 11.95)
- Get 2009-10 in The Questions Not Asked (PDF, USD 11.95)
- Get all of the first twelve years (2001-2012) in The Collected Issues of Point Lookout (PDF, USD 28.99)
Are you a writer, editor or publisher on deadline? Are you looking for an article that will get people talking and get compliments flying your way? You can have 500 words in your inbox in one hour. License any article from this Web site. More info
- The Race to the South Pole: The Power of Agile Development
- On 14 December 1911, four men led by Roald
Amundsen reached the South Pole. Thirty-five days later, Robert F. Scott and four others followed. Amundsen
had won the race to the pole. Amundsen's party returned to base on 26 January 1912. Scott's party perished.
As historical drama, why this happened is interesting enough. Lessons abound. Among the more important
lessons are those that demonstrate the power of the agile approach to project management and product
development. Read more about this program. Here's
a date for this program:
- Fifth Third Bank, 5717 Madison Road, Cincinnati, OH 45227:
Monthly Meeting, Cincinnati
chapter of the International Institute of Business Analysis. Register now.
- Fifth Third Bank, 5717 Madison Road, Cincinnati, OH 45227: July 17, Monthly Meeting, Cincinnati chapter of the International Institute of Business Analysis. Register now.
- The Power Affect: How We Express Our Personal Power
- Many people who possess real organizational power have a characteristic demeanor. It's the way they project their presence. I call this the power affect. Some people — call them power pretenders — adopt the power affect well before they attain significant organizational power. Unfortunately for their colleagues, and for their organizations, power pretenders can attain organizational power out of proportion to their merit or abilities. Understanding the power affect is therefore important for anyone who aims to attain power, or anyone who works with power pretenders. Read more about this program.