
Part of one of the tunnel boring machines used to build the tunnel under the English Channel. The Chunnel, like many long tunnels, was constructed by boring from both ends. Actually, boring machines worked in two directions from access points in both France and the U.K. The French and British efforts met under the channel on October 30, 1990, just under three years after boring operations began.
Tunnel boring provides an intriguing metaphor for forward backtracking. One advantage of forward backtracking not mentioned in this article is that, like tunnel boring, we can apply effort at both ends simultaneously. While one team tries to solve the problem in the forward sense, another can work out solutions using backtracking. The two teams can then assemble periodically and share insights, accelerating the work at both ends. In the case of the Chunnel, boring operations on either side of the Channel proceeded in both directions from access points near shore. By analogy, we can see that sometimes it's useful to break a problem into segments, and solve it in both directions from each of the segment boundaries. Photo courtesy BBC.
Nearly every morning, if I'm in town, I do a two-and-a-half mile loop around Fresh Pond, in Cambridge, Massachusetts. I usually go at about dawn. It's peaceful, quiet, and still, with plenty of opportunities to observe the kind of wildlife you find in urban parks. Today it was rabbits, cormorants, a hawk, and of course, some dogs walking their people.
Sometimes I vary my routine. For example, I might combine the trip with a trip to the automatic teller machine at a nearby bank. When I do that, I have to figure out where to leave the pond path for the climb through the woods over the multiple branching paths that lead up to the street to go to the bank. Until recently, I always emerged from the woods too far to the northeast. I never could find the right path through the woods.
Last week I had an idea. I reversed direction, going to the bank first, then down to the pond and around the pond path. That way, I could be sure to be on the right path through the woods. Well, it worked, of course. Duh.
Point is, the next time I want to get from the pond path to the automatic teller machine at the bank, I know how to do it, because I've been over the path before.
I call this forward backtracking. By beginning at the end, and ending at the beginning, you can figure out how to begin at the beginning and end at the end.
Strangely enough, forward backtracking applies far beyond getting from Fresh Pond to my bank. It's useful for solving the most complex problems, like adjusting a 20-month project schedule to meet an imposed deadline. A problem like that can be daunting, because it involves scheduling, resources, budgets, and — inevitably — politics.
The By beginning at the end,
and ending at the beginning,
you can figure out how
to begin at the beginning
and end at the endusual approach to such problems starts with creating lists of possible solution ideas. Then we apply them, one-by-one, or in combination, until we find something that works. If nothing works, we look for more ideas.
Forward backtracking provides some alternative approaches.
When looking for new ideas, we can apply forward backtracking by asking, "If we did have the solution, what would have been the last step that got us there?"
To discover people we might have forgotten to consult, we can ask, "If we did have a truly ingenious solution, who would have been most likely to have helped find it?"
Imaginary testing, too, can reveal attributes that help solutions: "If we had a candidate solution in hand, how would we know that it worked?"
Forward backtracking can help even beyond problem solving. For a new perspective on complex documents, try reviewing them back-to-front. And you need not worry — it won't spoil the ending. Top
Next Issue
Occasionally we have the experience of belonging to a great team. Thrilling as it is, the experience is rare. In part, it's rare because we usually strive only for adequacy, not for greatness. We do this because we don't fully appreciate the returns on greatness. Not only does it feel good to be part of great team — it pays off. Check out my Great Teams Workshop to lead your team onto the path toward greatness. More info
Your comments are welcome
Would you like to see your comments posted here? rbrentSgXnAlNVWlhxNIJner@ChacAtZoEYrrmofzZnjPoCanyon.comSend me your comments by email, or by Web form.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.
This article in its entirety was written by a human being. No machine intelligence was involved in any way.
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 Problem Solving and Creativity:
Obstacles to Compromise
- Compromise is the art of devising an approach acceptable to all parties. A talent for compromise is
rare. What makes finding compromises so difficult?
Ten Tactics for Tough Times: II
- When you find yourself in a tough spot politically, what can you do? Most of us obsess about the situation
for a while, and then if we still have time to act, we do what seems best. Here's Part II of a set of
approaches that can organize your thinking and shorten the obsessing.
Some Risks of Short-Term Fixes
- When we encounter a problem at work, we must choose between short-term fixes (also known as workarounds)
and long-term solutions. Often we choose workarounds without appreciating the risks we're accepting
— until too late.
Disjoint Concept Vocabularies
- In disputes or in problem-solving sessions, when we can't come to agreement, we often attribute the
difficulty to miscommunication, histories of disagreements, hidden agendas, or "personality clashes."
Sometimes the cause is much simpler. Sometimes the concept vocabularies of the parties have too little
in common.
Contrary Indicators of Psychological Safety: III
- When we first perform actions or play roles unfamiliar to us, we make mistakes. We learn new ways not
only by reading or being told, but also by practicing. Unless we feel that making mistakes at first
is acceptable, learning might never occur.
See also Problem Solving and Creativity and Problem Solving and Creativity for more related articles.
Forthcoming issues of Point Lookout
Coming April 2: Mitigating the Trauma of Being Laid Off
- Trauma is an emotional response to horrible events — accidents, crimes, disasters, physical abuse, emotional abuse, gross injustices — and layoffs. Layoff trauma is real. Employers know how to execute layoffs with compassion, but some act out of cruelty. Know how to defend yourself. Available here and by RSS on April 2.
And on April 9: Defining Workplace Bullying
- When we set out to control the incidence of workplace bullying, problem number one is defining bullying behavior. We know much more about bullying in children than we do about adult bullying, and more about adult bullying than we know about workplace bullying. Available here and by RSS on April 9.
Coaching services
I offer email and telephone coaching at both corporate and individual rates. Contact Rick for details at rbrentSgXnAlNVWlhxNIJner@ChacAtZoEYrrmofzZnjPoCanyon.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, )
- Get 2003-4 in Why Dogs Wag (PDF, )
- Get 2005-6 in Loopy Things We Do (PDF, )
- Get 2007-8 in Things We Believe That Maybe Aren't So True (PDF, )
- Get 2009-10 in The Questions Not Asked (PDF, )
- Get all of the first twelve years (2001-2012) in The Collected Issues of Point Lookout (PDF, )
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 500-1000 words in your inbox in one hour. License any article from this Web site. More info
Follow Rick





Recommend this issue to a friend
Send an email message to a friend
rbrentSgXnAlNVWlhxNIJner@ChacAtZoEYrrmofzZnjPoCanyon.comSend a message to Rick
A Tip A Day feed
Point Lookout weekly feed
