Nine Project Management Fallacies: III

Peter loved his chocolate chip cookies, but he liked this conversation with Trish and Nan even more. Holding his hands over the side of his chair to brush the cookie crumbs off them onto the ground, he added "And his discussion of wishful thinking was really insightful."

Nan broke off a tiny chunk of her cookie, ate it, and sipped her coffee. "Mmmm, I thought so too," she said. "Knowing that we fall into these fallacy traps because of our humanness made me more accepting of it, less guilty."

Trish was puzzled. "Yeah, but how does that help the project?"

"That's just it," said Nan. "Knowing that the fallacies are part of being human makes it easier to acknowledge these errors when we make them."

Peter finished Nan's thought. "And that way we can own up to them faster, maybe even before they do any damage."

Fallacies aren't just false. Because they have a deep connection to what we are as human beings, they'll never go away. Here's Part III of a little catalog of the fallacies of project management. For Part II, see "Nine Project Management Fallacies: II," Point Lookout for December 14, 2005, and for Part IV, see "Nine Project Management Fallacies: IV," Point Lookout for January 11, 2006.

The Fungibility Fallacy

The Fungibility Fallacy holds that each person produces one hour of output in one hour, and that we can substitute people for one another. Terms that suggest this fallacy are man-month headcount and FTE.

Often, only a few people can perform certain tasks. Using the project management tools that distinguish the skills of large numbers of unique individuals takes time and effort, and even then they produce somewhat fictitious results.

And running "lean and mean" makes the problem worse. If you count the cost of delays and lost market windows due to overloading key people, running a little "fatter and kinder" might actually be more profitable.

The Linearity Fallacy

Fallacies have
a deep connection
to what we are
as human beings

This fallacy holds that the human effort required to execute a project scales in proportion to project attributes such as project size or total budget.

Not only do operating costs per unit of output grow rapidly with project size, but the converse is also true: costs decline unexpectedly slowly as we scale the project down in size. This happens because we have difficulty abandoning control processes as we move down in size. We lose in both directions.

Project management is an inherently nonlinear activity. The complexity of an effort grows not in proportion to the effort, but combinatorially with the size of the effort, following the growth in the number of possible person-to-person interactions with increasing team size.

These two fallacies both arise because of our hopes and wishes. We long for a world where we can substitute any person for any other; for a world where doubling resources halves the schedule. But longing doesn't make it so. In the next and final installment of this series we'll look at fallacies that arise from failures of critical thinking.   First issue in this series    Next issue in this series   Top    Next Issue

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See also Project Management and Critical Thinking at Work for more related articles.

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Additive bias is a cognitive bias that many believe contributes to bloat of commercial products. When we change products to make them more capable, additive bias might not play a role, because economic considerations sometimes favor additive approaches. Available here and by RSS on July 3.

And on July 10: On Delegating Accountability: I

As the saying goes, "You can't delegate your own accountability." Despite wide knowledge of this aphorism, people try it from time to time, especially when overcome by the temptation of a high-risk decision. What can you delegate, and how can you do it? Available here and by RSS on July 10.

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