In group discussions, debates about issues are informal and sometimes fast-moving. They can move so quickly that the group's members don't realize that they have reached incorrect conclusions. When this happens, one or more rhetorical fallacies probably played a role — accidentally or intentionally inserted by one of the group's members.
Because of its subtlety, the Fallacy of Composition is a favorite of those who intentionally use rhetorical fallacies. When people use the Fallacy of Composition, they make statements about some parts of a whole (or even every part of a whole), and then conclude something about the whole. To illustrate the use of the fallacy, here's a particularly transparent form, just to give you the idea of how it works:
Since the global economy is in recession, and our jobs are less secure than they once were, everyone should pay off their debts and increase the fraction of their income that they save.
If we were to follow this advice, the recession would quickly become a depression, because economic activity would contract severely. Although the statement is probably true for individuals, the conclusion about the entirety of all individuals is false.
The Fallacy of Composition also occurs in group discussions about managing projects:
We can make up some time and get closer to the original schedule if Tim and Ellen work through the weekend. So it's probably best if everyone works every weekend for the rest of the project.
If we take this approach, people will become fatigued, their work quality will degrade, some will seek reassignment, and the project might never complete.
Here's an example in which an approval board finds two issues in a proposal, and then rejects the entirety on that basis:
We've found serious problems in the proposal. The Localization budget is too low, and the schedule for customer extensions is too aggressive. You need to rethink the whole thing.
The above Because of its subtlety,
the Fallacy of Composition
is a favorite of those
who intentionally use
rhetorical fallaciescomment omits any proof that the two flaws cited are justification for the final recommendation.
And from Glen's performance review:
I'm sorry I couldn't recommend you for a promotion this year. You had some trouble working with Fran, and there were also problems with Leo. You need to learn how to work better with people.
Perhaps the conclusion above is correct, but two difficult relationships are probably not adequate proof. For instance, if both Fran and Leo have problems with everyone, perhaps the problem isn't Glen's. This application of the Fallacy of Composition offers a convenient alternative to justifying decisions made for other reasons.
One important distinction between a Fallacy of Composition and valid inductive reasoning is the nature of the generalization. An inductive argument contains a proof of its generalization; a fallacy of composition merely suggests its generalization. It is the subtlety of this distinction that makes the Fallacy of Composition so difficult to identify in the moment. Top Next Issue
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More articles on Effective Meetings:
- How We Avoid Making Decisions
- When an important item remains on our To-Do list for a long time, it's possible that we've found ways
to avoid facing it. Some of the ways we do this are so clever that we may be unaware of them. Here's
a collection of techniques we use to avoid engaging difficult problems.
- Remote Facilitation in Synchronous Contexts: II
- Facilitators of synchronous distributed meetings — meetings that occur in real time, via telephone
or video — encounter problems that facilitators of face-to-face meetings do not. Here's Part II
of a little catalog of those problems, and some suggestions for addressing them.
- Virtual Meetings: Dealing with Inattention
- There is much we can do to reduce the incidence of inattention in virtual meetings. Cooperation is required.
- Historical Debates at Work
- One obstacle to high performance in teams is the historical debate — arguing about who said what
and when, or who agreed to what and when. Here are suggestions for ending and preventing historical debates.
- Barriers to Accepting Truth: I
- In workplace debates, a widely used strategy involves informing the group of facts or truths of which
some participants seem to be unaware. Often, this strategy is ineffective for reasons unrelated to the
credibility of the person offering the information. Why does this happen?
Forthcoming issues of Point Lookout
- Coming October 5: Downscoping Under Pressure: I
- When projects overrun their budgets and/or schedules, we sometimes "downscope" to save time and money. The tactic can succeed — and fail. Three common anti-patterns involve politics, the sunk cost effect, and cognitive biases that distort estimates. Available here and by RSS on October 5.
- And on October 12: Downscoping Under Pressure: II
- We sometimes "downscope" projects to bring them back on budget and schedule when they're headed for overruns. Downscoping doesn't always work. Cognitive biases like the sunk cost effect and confirmation bias can distort decisions about how to downscope. Available here and by RSS on October 12.
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