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? rbrenuQKLUMsVubCpqOpqner@ChacCCvpZbzKGsgliMGNoCanyon.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:
- Should I Keep Bailing or Start Plugging the Leaks?
- When we're flooded with problems, and the rowboat is taking on water, we tend to bail with buckets,
rather than take time out to plug the leaks. Here are some tips for dealing with floods of problems.
- Help for Asking for Help
- When we ask for help, from peers or from those with organizational power, we have some choices. How
we go about it can determine whether we get the help we need, in time for the help to help.
- Coping and Hard Lessons
- Ever have the feeling of "Uh-oh, I've made this mistake before"? Some of these oft-repeated
mistakes happen not because of obstinacy, or stupidity, or foolishness, but because the learning required
to avoid them is just plain difficult. Here are some examples of hard lessons.
- Workplace Anti-Patterns
- We find patterns of counter-effective behavior — anti-patterns — in every part of life,
including the workplace. Why? What are their features?
- Entry Intimidation
- Feeling intimidated about entering a new work situation can affect performance for both the new entrant
and for the group as a whole. Four trouble patterns related to entry intimidation are inadvertent subversion,
bullying, hat hanging, and defenses and sabotage.
Forthcoming issues of Point Lookout
- Coming July 8: Multi-Expert Consensus
- Some working groups consist of experts from many fields. When they must reach a decision by consensus, members have several options. Defining those options in advance can help the group reach a decision with all its relationships intact. Available here and by RSS on July 8.
- And on July 15: Disjoint Concept Vocabularies
- In disputes or in problem solving sessions, when we can't seem to come to agreement, we often attribute the difficulty to miscommunication, histories of disagreements, hidden agendas, or "personality clashes." Sometimes the cause is much simpler. Sometimes the concept vocabularies of the parties don't overlap. Available here and by RSS on July 15.
I offer email and telephone coaching at both corporate and individual rates. Contact Rick for details at rbrenuQKLUMsVubCpqOpqner@ChacCCvpZbzKGsgliMGNoCanyon.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, )
- Get 2003-4 in Why Dogs Wag (PDF, )
- Get 2005-6 in Loopy Things We Do (PDF, )
- Get 2007-8 in Things We Believe That Maybe Aren't So True (PDF, )
- Get 2009-10 in The Questions Not Asked (PDF, )
- Get all of the first twelve years (2001-2012) in The Collected Issues of Point Lookout (PDF, )
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 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.
- Bullet Points: Mastery or Madness?
Decision-makers in modern organizations commonly demand briefings in the form of bullet points or a series of series of bullet points. But this form of presentation has limited value for complex decisions. We need something more. We actually need to think. Briefers who combine the bullet-point format with a variety of persuasion techniques can mislead decision-makers, guiding them into making poor decisions. Read more about this program.