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.

Take Regular Temperature Readings

Team interactions are unimaginably complex. To avoid misunderstandings, offenses, omissions and mistaken suppositions, teams need open communications. But no one has a full picture of everything that's happening. The Temperature Reading is a tool for surfacing hidden and invisible information, puzzles, appreciations, frustrations and feelings.

When Meetings Boil Over

At any time, without warning, you can find yourself in a meeting that boils over. Sometimes tempers rise, then voices rise, and then people yell and scream. What can a team do when meetings threaten to boil over — and when they do?

What Haven't I Told You?

When a project team hits a speed bump, it often learns that it had all the information it needed to avoid the problem, sometimes months in advance of uncovering it. Here's a technique for discovering this kind of knowledge more systematically.

Plopping

When we offer a contribution to a discussion, and everyone ignores it and moves on, we sometimes feel that our contribution has "plopped." We feel devalued. Rarely is this interpretation correct. What is going on?

When Power Attends the Meeting

When the boss or supervisor of the chair of a regular meeting "sits in," disruption almost inevitably results, and it's usually invisible to the visitor. Here are some of the risks of sitting in on the meetings of your subordinates.

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

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Organizational Politics for People Who Hate Politics

Have you ever felt powerless to implement an important new idea? Have you ever been "blind-sided" at a meeting? Have you ever lost two good employees because you could find no way to keep them from attacking each other? These are some of the issues of organizational politics. Many of us have become enmeshed in them from time to time, but we've also known some people who seem to be able to engage and prosper. How is that done? We'll inventory the challenges of organizational politics, and provide tools for anticipating and addressing them. The focus of this program is practical — attendees learn concrete techniques for dealing with the problems that arise in workplace politics, while keeping their integrity intact. Read more about this program. Here are some upcoming dates for this program:

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  your calendarRichmond, VA (South Side): March 17, Southside Dinner Meeting, Central Virginia Chapter of The Project Management Institute.
   
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  your calendarRichmond, VA (West End): March 18, West End Dinner Meeting, Central Virginia Chapter of The Project Management Institute.
   
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  your calendarThe Conference Center at Bentley in Waltham, MA: May 1, Professional Development Day, Massachusetts Bay Chapter of the Project Management Institute. 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 are some upcoming dates for this program:

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  your calendarMelbourne, FL: April 12, Monthly Meeting, Space Coast Florida Chapter of the Project Management Institute. Register now.
   
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  your calendarHilton Garden Inn, Idaho Falls, ID: April 15, Professional Development Day, Eastern Idaho Chapter of the Project Management Institute.
   
• Download to
  your calendarThe Conference Center at Bentley in Waltham, MA: May 1, Professional Development Day, Massachusetts Bay Chapter of the Project Management Institute. Register now.
   
• Fort Wayne, IN: September 22, Monthly Meeting, Northeast Indiana Chapter of the Project Management Institute.
   
• Overland Park Convention Center, Overland Park, KS: October 4, Professional Development Day, Kansas City Chapter of the Project Management Institute.
   
• Download to
  your calendarMITRE, in Bedford, MA: February 15, 2011, Monthly Meeting, Boston SPIN.
   

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's an upcoming date for this program:

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  your calendarHilton Garden Inn, Idaho Falls, ID: April 15, Professional Development Day, Eastern Idaho 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 are some upcoming dates for this program:

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  your calendarHilton Garden Inn, Idaho Falls, ID: April 15, Professional Development Day, Eastern Idaho Chapter of the Project Management Institute.
   
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  your calendarWherever you are: it's a webinar: August 3, Monthly Meeting Webinar, Memphis Chapter of the Project Management Institute.
   

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 calendarHilton Garden Inn, Idaho Falls, ID: April 15, Professional Development Day, Eastern Idaho Chapter of the Project Management Institute.
   

Managing Virtual Teams for Real Results

Managing global or dispersed teams is challenging — miscommunications, misunderstandings, and interpersonal conflict all thrive in the typical environment of the distributed team. And they're even more common in global teams, because of time-zone offsets and language and cultural differences. We'll inventory the challenges distributed and global teams face, and provide tools for anticipating and addressing them. The focus of this program is practical — attendees will learn concrete techniques for preventing and dealing with the problems that accompany global and distributed teams. Read more about this program. Here's an upcoming date for this program:

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  your calendarKitchener, Ontario: May 19, Dinner Meeting, PMI Canada's Technology Triangle Chapter.