March 4, 2009	Volume 9, Issue 9
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The Fallacy of Composition

by Rick Brenner

Rhetorical fallacies are errors of reasoning that introduce flaws in the logic of arguments. Used either intentionally or by accident, they often lead us to mistaken conclusions. The Fallacy of Composition is one of the more subtle fallacies, which makes it especially dangerous.

n group discussions, debates about issues are informal and sometimes fast-moving. They can move so fast 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.

A structure on the Mississippi River, built by the US Army Corps of Engineers (USACE), and known as the Old River Control Structure. It is part of a complex whose purpose is controlling the flow from the Mississippi into a distributary known as the Atchafalaya River. Were it not for this facility, the Mississippi would long ago have rerouted itself into the Atchafalaya, which has a much steeper gradient to the ocean. Since that change would have deprived New Orleans and all the industrial facilities along the lower Mississippi of access to the water and navigational channels they now enjoy, the USACE maintains a complex of flow control facilities to prevent nature taking its course. But this project, together with a multitude of levees, dredging projects, and gates throughout lower Louisiana, has had unintended consequences, including erosion of the Louisiana shoreline at the rate of 50 square miles per year. The entirety of the intervention can be viewed as an example of the Fallacy of Composition: even though each element of the whole intervention makes sense, the whole of the result might not. For more about Atchafalaya, see the famous article by John McPhee, which appeared in the February 23, 1987, issue of The New Yorker. Photo by Michael Maples, courtesy US Army Corps of Engineers.

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.

Because of its subtlety,
the Fallacy of Composition
is a favorite of those
who intentionally use
rhetorical fallaciesThe above comment 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

Do you spend your days scurrying from meeting to meeting? Do you ever wonder if all these meetings are really necessary? (They aren't) Or whether there isn't some better way to get this work done? (There is) Read 101 Tips for Effective Meetings to learn how to make meetings much more productive and less stressful — and a lot more rare. Order Now!

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Do you face a complex interpersonal situation? Send it in, anonymously if you like, and I'll give you my two cents.

First Aid for Painful Meetings

The foundation of any team meeting is its agenda. A crisply focused agenda can make the difference between a long, painful affair and finishing early. If you're the meeting organizer, develop and manage the agenda for maximum effectiveness.

Games for Meetings: Part II

We spend a lot of time and emotional energy in meetings, much of it engaged in any of dozens of ritualized games. Here's Part II of a little catalog of some of our favorites, and what we could do about them.

Decisions, Decisions: Part I

Most of us have participated in group decision-making. The process can be frustrating and painful, but it can also be thrilling. What processes do groups use to make decisions? How do we choose the right process for the job?

Recovering Time: Part I

Where do the days go? How can it be that we spend eight, ten, or twelve hours at work each day and get so little done? To recover time, limit the fragmentation of your day. Here are some tips for structuring your working day in larger chunks.

Questioning Questions

In meetings and other workplace discussions, questioning is a common form of conversational contribution. Questions can be expensive, disruptive, and counterproductive. For most exchanges, there is a better way.

See also Effective Meetings, Critical Thinking and Rhetorical Fallacies for more related articles.

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Person-to-Person Communication for Project Managers

When we talk, listen, send or read emails, read or write memos, or when we leave or listen to voice mail messages, we're communicating person-to-person. And whenever we communicate person-to-person, we risk being misunderstood, offending others, feeling hurt, and being confused. There are so many ways for things to go wrong that we could never learn how to fix all the problems. A more effective approach avoids problems altogether, or at least minimizes their occurrence. In this very interactive program you'll learn a model of inter-personal communications that can help you stay out of the ditch. In those moments of intense involvement, when we're most likely to slip, you'll have a new tool to use to keep things constructive. Read more about this program. Here are some upcoming dates for this program:

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• Houston, Texas: May 9, Monthly Meeting, Houston Chapter of the Project Management Institute.
   

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 an upcoming date for this program:

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  your calendarSt. George Banquet Hall, Kitchener, Ontario: March 6, Dinner Meeting, Canada's Technology Triangle Chapter of the Project Management Institute. Register now.
   

Human-Centered Risk Management

Most of us can assess technological risks, but risks related to human behavior tend to resist our best efforts. This session provides a framework for evaluating risks related to the behavior of individuals, teams, organizations and people generally. Human-centered risk differs from technological or market risk, because objective evaluation requires acknowledging personal and organizational limitations and failures. Since some of those limitations and failures might apply to the people assessing the risks, or to their superiors, there's a tendency to deny them or to explain them away. Our approach examines capability, organization, context, risk mitigation, and workplace politics. It has tools for guiding the assessment and management of human-centered risk, and we show how to extend these tools to suit your situation. You'll learn how to identify sources of risk in human behavior; recognize systemic and individual barriers to acknowledging risk; assess the effects of organizational turbulence; determine the risk associated with inappropriate internal risk transfer; estimate the effects of team dysfunction, toxic conflict and turnover; and measure the impact of workplace politics. Read more about this program. Here's an upcoming date for this program:

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  your calendarMITRE, in Bedford, Massachusetts: March 20, Monthly Meeting, Boston SPIN. Register now.
   

The Race to the South Pole: Ten Lessons for Project Managers

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, but to project managers, the story is fascinating. Lessons abound. Read more about this program. Here's an upcoming date for this program:

• Columbia, Missouri: May 17, Full-Day Workshop, Mid Missouri Chapter of the Project Management Institute.
   

Project Management in Fluid Environments

Most people now work in environments that can best be characterized as fluid, because they're subject to continual change. We never know what's coming next. In such environments, managing — teams, projects, groups, departments, or the enterprise — often entails moving from surprise to surprise while somehow staying almost on track. It's a nerve-wracking existence. This program provides numerous tools that help project managers who work in fluid environments. Read more about this program. Here's an upcoming date for this program:

• Columbia, Missouri: May 17, Monthly Meeting, Mid Missouri Chapter of the Project Management Institute.
   

The Politics of Meetings for People Who Hate Politics

There's a lot more to running an effective meeting than having the right room, the right equipment, and the right people. With meetings, the whole really is more than the sum of its parts. How the parts interact with each other and with external elements is as important as the parts themselves. And those interactions are the essence of politics for meetings. This program explores techniques for leading meetings that are based on understanding political interactions, and using that knowledge effectively to meet organizational goals. Read more about this program. Here's an upcoming date for this program:

• Rochester, New York: May 24, Professional Development Day, Rochester Chapter of the Project Management Institute.