The short version
Kahneman's terms are System 1 (fast, automatic, effortless) and System 2 (slower, effortful, deliberate). Thaler and Sunstein's Nudge calls the same split the Automatic System and the Reflective System.
The idea is about fast, habitual judgment versus slow, deliberate thinking. Body reflexes like blinking are not good examples.
People with strong self-control rely on habits and on shaping their situations more than on resisting in the moment.
In a Cochrane review, moving food farther away reduced how much people ate, a moderate effect with low-certainty evidence (Hollands et al., 2019).
Two systems, two sets of names
In his Nobel lecture, Daniel Kahneman (2002) used labels from Stanovich and West: "The operations of System 1 are fast, automatic, effortless, associative, and difficult to control or modify. The operations of System 2 are slower, serial, effortful, and deliberately controlled." System 1 produces impressions; System 2 monitors them, often lightly.
Thaler and Sunstein (2008) describe the same two kinds of thinking in Nudge: "We will call the first the Automatic System and the second the Reflective System." If you hear coaches use both sets of terms, they mean the same thing.
Two corrections to how this often gets taught:
Leave out reflexes. Blinking, swallowing, or pulling a hand off a hot stove are body reflexes, not judgments. Better System 1 examples are learned responses: reading a familiar word, knowing your own phone number, or heading to the snack drawer when you walk into the kitchen at 3 p.m. A System 2 example is comparing two health insurance plans line by line.
Leave out the priming examples. The social priming studies in Kahneman's popular book did not hold up. An analysis of the 31 studies cited in that chapter found strong signs of selective reporting (Schimmack et al., 2017), and Kahneman replied on that page: "I placed too much faith in underpowered studies." He added that priming effects "cannot be as large and as robust as my chapter suggested."
Kahneman also described how easily things come to mind (what he calls accessibility) as "a continuum, not a dichotomy," and noted that "the acquisition of skill selectively increases the accessibility of useful responses." That's the hopeful part for coaching: deliberate practice moves a behavior toward the fast, automatic end.
The Planner and the Doer
Thaler (2017) opens part of his Nobel lecture with a dinner party story. He put out a bowl of cashews, guests kept eating, and everyone was relieved when he moved the bowl to the pantry. To explain it, he and economist Hersh Shefrin had modeled each person as 2 parts: a long-sighted "Planner" and a myopic "Doer." He later carried the Planner and Doer into Nudge.
In Thaler's account, the Planner has 2 tools. One is commitment: arranging things ahead of time, like the cashews in the pantry. The other is getting the Doer to use willpower through something like guilt, which he calls costly: "Guilt acts as a tax on consumption." The first tool is the one coaches can work with.
Why setup beats willpower
Strong self-control looks less like resisting. Galla and Duckworth (2015) ran 6 studies with 2,274 people. People with more self-control reported less effortful resisting in daily life, and their beneficial habits (healthy snacks, exercise, consistent sleep, study habits) helped explain the link between self-control and good outcomes.
Earlier is easier. Duckworth, Gendler, and Gross (2016) lay out self-control strategies along the timeline of an impulse. Because impulses tend to grow stronger, strategies that choose or change the situation early, like the partygoer who sits far from where drinks are poured or the student who goes to the library without a phone, can stop an impulse before it builds. They note we may underrate these strategies because they remove the felt struggle.
Willpower probably doesn't "run out" the way people say. The idea that self-control drains like a fuel tank was tested across 23 labs with 2,141 people, and the effect was essentially zero (d = 0.04; Hagger et al., 2016). So the reason to set up surroundings is not that willpower is scarce. It's that a good setup makes the struggle unnecessary.
Surroundings change behavior. Hollands and colleagues (2019) reviewed 24 randomized trials, all on food. Across 12 studies with 1,098 people, food placed farther away was eaten less (SMD -0.60, a moderate effect). Fewer options led to a large drop in choosing the targeted foods (SMD -1.13), but that came from only 3 small studies. Certainty was low or very low, most studies were lab-based, and 20 of 24 raised risk-of-bias concerns. These were changes researchers made; when a client rearranges their own space, we're extending the finding, not applying it directly.
Using it with clients
Name the two modes in plain words.
"It sounds like the plan makes total sense when you're thinking it through, and then in the moment something else takes over."
Treat session time as Planner time. The client is in reflective mode with you. Use it to set things up for the moment that matters.
"Since we're thinking it through now, what could you set up ahead of time so the evening goes the way you'd like?"
Let the client design the setup. They choose what to move closer (water on the desk, walking shoes by the door) and what to move farther away.
Take the moral weight off. When a plan falls apart, reflect the situation rather than the person.
"So the setup made the old routine the easy choice that night. What would you change about the setup?"
Plan the handoff. Early on, a new behavior takes deliberate effort. The aim is that, with repetition in the same setting, it moves toward running on its own and needs less effort.
Where coaching stops
Coaches help clients arrange surroundings for goals the client has chosen. Coaches don't decide which foods a client should keep or remove; nutrition questions go to a registered dietitian. If a client's sense of being "out of control" involves binge eating, substance use, or significant distress, refer to a mental health professional.
Go deeper
Advanced Skills Through Cases, a One James course, is in development and is the closest match for turning these ideas into skilled session work.
References
Duckworth, A. L., Gendler, T. S., & Gross, J. J. (2016). Situational strategies for self-control. Perspectives on Psychological Science, 11(1), 35–55. https://doi.org/10.1177/1745691615623247
Galla, B. M., & Duckworth, A. L. (2015). More than resisting temptation: Beneficial habits mediate the relationship between self-control and positive life outcomes. Journal of Personality and Social Psychology, 109(3), 508–525. https://doi.org/10.1037/pspp0000026
Hagger, M. S., Chatzisarantis, N. L. D., Alberts, H., Anggono, C. O., Batailler, C., Birt, A. R., Brand, R., Brandt, M. J., Brewer, G., Bruyneel, S., Calvillo, D. P., Campbell, W. K., Cannon, P. R., Carlucci, M., Carruth, N. P., Cheung, T., Crowell, A., De Ridder, D. T. D., Dewitte, S., . . . Zwienenberg, M. (2016). A multilab preregistered replication of the ego-depletion effect. Perspectives on Psychological Science, 11(4), 546–573. https://doi.org/10.1177/1745691616652873
Hollands, G. J., Carter, P., Anwer, S., King, S. E., Jebb, S. A., Ogilvie, D., Shemilt, I., Higgins, J. P. T., & Marteau, T. M. (2019). Altering the availability or proximity of food, alcohol, and tobacco products to change their selection and consumption. Cochrane Database of Systematic Reviews, 2019(9), CD012573. https://doi.org/10.1002/14651858.CD012573.pub3
Kahneman, D. (2002). Maps of bounded rationality: A perspective on intuitive judgment and choice [Nobel Prize lecture]. Nobel Foundation. https://www.nobelprize.org/uploads/2018/06/kahnemann-lecture.pdf
Schimmack, U., Heene, M., & Kesavan, K. (2017, February 2). Reconstruction of a train wreck: How priming research went off the rails [Blog post, with comment by D. Kahneman, February 14, 2017]. Replicability-Index. https://replicationindex.com/2017/02/02/reconstruction-of-a-train-wreck-how-priming-research-went-of-the-rails/
Thaler, R. H. (2017). From cashews to nudges: The evolution of behavioral economics [Nobel Prize lecture]. Nobel Foundation. https://www.nobelprize.org/uploads/2018/01/thaler-lecture.pdf
Thaler, R. H., & Sunstein, C. R. (2008). Nudge: Improving decisions about health, wealth, and happiness. Yale University Press. Excerpt: https://www.aarp.org/entertainment/books/book-excerptnudge-improving-decisions-about-health-wealth-and-happiness/
