Here is an excerpt from an article written by Heidi Grant Halvorson for the Harvard Business Review blog. To read the complete article, check out the wealth of free resources, and sign up for a subscription to HBR email alerts, please click here.

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The road to hell may or may not be paved with good intentions, but the road to failure surely is.

Take a good look at the people you work with, and you’ll find lots of Good Starters — individuals who want to succeed, and have promising ideas for how to make that happen. They begin each new pursuit with enthusiasm, or at the very least, a commitment to getting the job done.

And then something happens. Somewhere along the way, they lose steam. They get bogged down with other projects. They start procrastinating and miss deadlines. Their projects take forever to finish, if they get finished at all.

Does all this sound familiar? Maybe a little too familiar? If you are guilty of being a Good Starter, but a lousy finisher — at work or in your personal life — you have a very common problem. After all, David Allen’s Getting Things Done wouldn’t be a huge bestseller if people could easily figure out how to get things done on their own.

More than anything else, becoming a Great Finisher is about staying motivated from a project’s beginning to its end. Recent research has uncovered the reason why that can be so difficult, and a simple and effective strategy you can use to keep motivation high.

In their studies, University of Chicago psychologists Minjung Koo and Ayelet Fishbach examined how people pursuing goals were affected by focusing on either how far they had already come (to-date thinking) or what was left to be accomplished (to-go thinking). People routinely use both kinds of thinking to motivate themselves. A marathon runner may choose to think about the miles already traveled or the ones that lie ahead. A dieter who wants to lose 30 pounds may try to fight temptation by reminding themselves of the 20 pounds already lost, or the 10 left to go.

Intuitively, both approaches have their appeal. But too much to-date thinking, focusing on what you’ve accomplished so far, will actually undermine your motivation to finish rather than sustain it.

Koo and Fishbach’s studies consistently show that when we are pursuing a goal and consider how far we’ve already come, we feel a premature sense of accomplishment and begin to slack off. For instance, in one study, college students studying for an exam in an important course were significantly more motivated to study after being told that they had 52% of the material left to cover, compared to being told that they had already completed 48%.

When we focus on progress made, we’re also more likely to try to achieve a sense of “balance” by making progress on other important goals. This is classic Good Starter behavior — lots of pots on the stove, but nothing is ever ready to eat.

If, instead, we focus on how far we have left to go (to-go thinking), motivation is not only sustained, it’s heightened. Fundamentally, this has to do with the way our brains are wired. To-go thinking helps us tune in to the presence of a discrepancy between where we are now and where we want to be. When the human brain detects a discrepancy, it reacts by throwing resources at it: attention, effort, deeper processing of information, and willpower.

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To read the complete article, please click here.

Heidi Grant Halvorson, Ph.D. is a motivational psychologist, and

author of the Succeed: How We Can Reach Our Goals (Hudson Street Press, 2010). She is also an expert blogger on motivation and leadership for Fast Company and Psychology Today. Her personal blog, The Science of Success, can be found at www.heidigranthalvorson.com. You can also follow her on Twitter @hghalvorson.