Scope Creep and the Planning Fallacy

Google "scope creep" and you get over three million hits. Mission creep gets 700,000. Feature creep also gets over 700,000. That's pretty good for a technical concept, even if it isn't quite "miley" territory (160 million). The concept is known widely enough that anyone with project involvement has probably had first-hand experience with scope creep.

If we know so much about scope creep, why haven't we eliminated it? One simple possible answer: Whatever techniques we're using probably aren't working. Maybe the explanation is that we're psychologically challenged — that is, we, as humans, have a limited ability to detect scope creep, or to acknowledge that it's happening. If that's the case, a reasonable place to search for mechanisms to explain its prevalence is the growing body of knowledge about cognitive biases.

A cognitive bias is the tendency to make systematic errors of judgment based on thought-related factors rather than evidence. For example, a bias known as self-serving bias causes us to tend to attribute our successes to our own capabilities, and our failures to situational disorder.

Cognitive biases offer an enticing possible explanation for the prevalence of scope creep despite our awareness of it, because "erroneous intuitions resemble visual illusions in an important respect: the error remains compelling even when one is fully aware of its nature." [Kahneman 1977] Let's consider one example of how a cognitive bias can make scope creep more likely.

In their 1977 report, Kahneman and Tversky identify one particular cognitive bias, the planning fallacy, which afflicts planners. They The planning fallacy can lead to
scope creep because underestimates
of cost and schedule can lead
decision makers to feel that
they have time and resources
that don't actually existdiscuss two types of information used by planners. Singular information is specific to the case at hand; distributional information is drawn from similar past efforts. The planning fallacy is the tendency of planners to pay too little attention to distributional evidence and too much to singular evidence, even when the singular evidence is scanty or questionable. Failing to harvest lessons from the distributional evidence, which is inherently more diverse than singular evidence, the planners tend to underestimate cost and schedule.

But because the planning fallacy leads to underestimates of cost and schedule, it can also lead to scope creep. Underestimates can lead decision makers to feel that they have time and resources that don't actually exist: "If we can get the job done so easily, it won't hurt to append this piece or that."

Accuracy in cost and schedule estimates thus deters scope creep. We can enhance the accuracy of estimates by basing them not on singular data alone, but instead on historical data regarding organizational performance for efforts of similar kind and scale. And we can require planners who elect not to exploit distributional evidence in developing their estimates to explain why they made that choice.

In coming issues we'll examine other cognitive biases that can contribute to scope creep.  Next in this series  Top    Next Issue

Is every other day a tense, anxious, angry misery as you watch people around you, who couldn't even think their way through a game of Jacks, win at workplace politics and steal the credit and glory for just about everyone's best work including yours? Read 303 Secrets of Workplace Politics, filled with tips and techniques for succeeding in workplace politics. More info

Footnotes

Your comments are welcome

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.

Point Lookout is a free weekly email newsletter. Browse the archive of past issues. Subscribe for free.

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.

Related articles

More articles on Project Management:

The Cheapest Way to Run a Project Is with Enough Resources

Cost reduction is so common that nearly every project plan today should include budget and schedule for several rounds of reductions. Whenever we cut costs, we risk cutting too much, so it pays to ask, "If we do cut too much, what are the consequences?"

The True Costs of Cost-Cutting

The metaphor "trimming the fat" rests on the belief that some parts of the organization are expendable, and we can remove them with little impact on the remainder. Ah, if only things actually worked that way...

Symbolic Self-Completion and Projects

The theory of symbolic self-completion holds that to define themselves, humans sometimes assert indicators of achievement that either they do not have, or that do not mean what they seem to mean. This behavior has consequences for managing project-oriented organizations.

Unresponsive Suppliers: I

If we depend on suppliers for some tasks in a project, or for necessary materials, their performance can affect our ability to meet deadlines. What can we do when a supplier's performance is problematic, and the supplier doesn't respond to our increasingly urgent pleas for attention?

Unresponsive Suppliers: II

When a project depends on external suppliers for some tasks and materials, supplier performance can affect our ability to meet deadlines. How can communication help us get what we need from unresponsive suppliers?

See also Project Management, Emotions at Work and Cognitive Biases at Work for more related articles.

Forthcoming issues of Point Lookout

Coming August 22: Dealing with Credit Appropriation

Very little is more frustrating than having someone else claim credit for the work you do. Worse, sometimes they blame you if they get into trouble after misusing your results. Here are three tips for dealing with credit appropriation. Available here and by RSS on August 22.

And on August 29: Please Reassure Them

When things go wildly wrong, someone is usually designated to investigate and assess the probability of further trouble. That role can be risky. Here are three guidelines for protecting yourself if that role falls to you. Available here and by RSS on August 29.

Coaching services

I offer email and telephone coaching at both corporate and individual rates. Contact Rick for details at rbrenfOnJgTfSVTjVgtmMner@ChacrBehwHSLmxdCvDJDoCanyon.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, USD 11.95)
• Get 2003-4 in Why Dogs Wag (PDF, USD 11.95)
• Get 2005-6 in Loopy Things We Do (PDF, USD 11.95)
• Get 2007-8 in Things We Believe That Maybe Aren't So True (PDF, USD 11.95)
• Get 2009-10 in The Questions Not Asked (PDF, USD 11.95)
• Get all of the first twelve years (2001-2012) in The Collected Issues of Point Lookout (PDF, USD 28.99)

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

Public seminars

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.

• A recording of a program presented 6:00 PM June 29 (Eastern Time), Monthly Webinar, Technobility Webinar Series. You can earn 1.0 Category 'A' PDU by viewing this program. View this program now.