Clear, Fogg, and Duhigg: three models, one week

James Clear, BJ Fogg, and Charles Duhigg are popularisers with different jobs. Duhigg, in The Power of Habit (2012), gave a mass audience the cue-routine-reward loop. Fogg, in the behaviour model and in Tiny Habits (2019), gave a lab-derived recipe: motivation, ability, prompt, plus a behaviour small enough to survive a bad day. Clear, in Atomic Habits (2018), synthesised identity, environment, and four "laws" into a field guide. None of them replaced the underlying science. If you treat the three books as competing religions, you will spend the week arguing about branding. If you treat them as maps, you can run one behaviour through all three in seven days and see what actually moves.

The mechanisms underneath are older and more boring. Wendy Wood and colleagues treat habits as context-cued automaticity: a stable setting evokes an action with less need for a fresh intention. Peter Gollwitzer's implementation intentions attach that action to an if-then. Phillippa Lally, van Jaarsveld, Potts, and Wardle (2010) measured how automaticity grew with repetition of a defined daily act, median around 66 days, wide range, a missed day not fatal. Ann Graybiel's basal-ganglia work, which Duhigg popularised with rat maze stories, is about chunking a sequence so it can run as a unit. William James and Edward Thorndike were writing about habit and consequence a century earlier. The bestsellers are the translation layer.

Three maps of the same street

Duhigg's loop is a diagnostic. Name the cue (time, place, people, preceding action). Name the routine. Name the reward you are actually getting, which is often not the one you claim. Craving, in his telling, glues the loop. That craving language is popular psychology. The useful half is the inspection: if you cannot name the cue, you do not have a habit yet, you have a hope. The habit loop: cue, routine, reward is the longer version of that inspection.

Fogg's B = MAP (behaviour happens when motivation, ability, and a prompt converge) is a design rule. When the behaviour fails, you do not lecture motivation. You raise ability by shrinking the act, or you install a prompt that already exists in the day. Celebration, in Tiny Habits, is a small, immediate mark that "this counts." That is closer to reinforcement than to a streak. Fogg's famous flossing example is the shrink move: floss one tooth after you pee, then let it grow. Tiny habits and the two-minute rule is Clear's neighbouring translation of the same shrink.

Clear's four laws (make it obvious, attractive, easy, satisfying) are a checklist that sits on top of both. Obvious is cue and environment (Wood). Attractive is what Duhigg called craving and what researchers more carefully call incentive or, in Milkman's work, temptation bundling. Easy is Fogg's ability. Satisfying is the immediate consequence that makes repetition more likely. Identity, in Clear, is the story that grows from repeated votes. The underlying psychology here is closer to self-perception (Daryl Bem: we infer who we are from what we repeatedly do) than to a slogan. Identity-based habits, without the slogan keeps that from turning into cosplay.

One week, one behaviour, three passes

Pick a single act you can do daily in the same place. Write it as an if-then (Gollwitzer). That is day zero.

Days 1-2, Duhigg pass: write the current loop, including the competing routine (phone, snooze, leftover from yesterday). Do not add a new identity. Name the reward the competing routine is paying.

Days 3-4, Fogg pass: shrink until ability is embarrassing. Attach to an anchor you already do. Prompt is the anchor, not a new alarm if you can help it. Should reminders nag is the prompt essay.

Days 5-7, Clear pass: make the cue obvious in the room (book on the kettle, mat in the doorway). Make the first two minutes easy. Log in a way that is satisfying because it is true, not because it is a firework. Yes/no, quantity, timer, or a 1-to-5 scale is the log.

You will notice the three passes overlap. That is the point. They are not three religions. They are three angles on cue, size, and repetition. Lally's curve will not finish in a week. A week is enough to see whether the sentence is runnable.

Populariser	Handy phrase	Mechanism to keep	What to ignore
Duhigg	Cue, routine, reward	Inspect the competing loop	Treating "craving" as a brain hack
Fogg	Tiny, after I, celebrate	Shrink ability, use a real prompt	Collecting celebrations instead of reps
Clear	Four laws, identity, 1%	Environment and small votes	Compound-interest cartoons as physics

What 1% better gets wrong is the caution on Clear's most viral metaphor. Atomic Habits in practice is how to use the four laws without reciting the book. This post is only the triangulation: three maps, one street, one week.

A tracker is optional. If you use one, it stores the sentence and the log. It does not decide which populariser you "are." Habit AI is a useful example of that boring storage: a sentence in, a matching log type, no need to pick a guru. The mechanisms still happen in the kitchen.

If the week fails, do not switch authors. Switch the cue or the size. The library is not the bottleneck. The room is.

Read next

The habit loop: cue, routine, reward is Duhigg's map with the science attached. Tiny habits and the two-minute rule is Fogg's shrink plus Clear's neighbouring rule. For a place to store the sentence, see how Habit AI works.