The habit loop: cue, craving, response, reward
Every habit runs the same four-step circuit. Step through it with an example, then map one of your own and find the step you can change.
“Your phone buzzes on the desk”
Something in your environment or internal state that predicts a reward: a time, a place, a feeling, other people, or the action you just finished.
Lever: to build a habit, make it obvious; to break one, make it invisible.
Three steps or four?
Charles Duhigg’s The Power of Habit (2012), drawing on research from MIT’s Ann Graybiel lab, described the loop as cue → routine → reward. James Clear’s Atomic Habits (2018) inserts craving between the cue and the routine, and calls the routine the response.
The extra step matters for design: it adds a fourth lever. Each stage maps to one of Clear’s four laws of behaviour change, and each law can be inverted to break a habit.
| Stage | To build | To break |
|---|---|---|
| Cue | Make it obvious | Make it invisible |
| Craving | Make it attractive | Make it unattractive |
| Response | Make it easy | Make it difficult |
| Reward | Make it satisfying | Make it unsatisfying |
Keep the cue, swap the routine
Duhigg’s “Golden Rule” for changing a habit is to keep the same cue and reward but insert a new routine. It works because the cue will keep firing either way. See the full plan on breaking a bad habit.
Sources: Duhigg, C. (2012). The Power of Habit. Clear, J. (2018). Atomic Habits. Wood, W. & Rünger, D. (2016). Psychology of habit. Annual Review of Psychology, 67.
Keep designing
- Habit trackerDesign habits with a cue, identity and 2-minute start, then stitch off each day.
- Habit stackingAnchor a new habit to one you already do.
- 2-Minute RuleShrink any habit until starting is easy.
- Tiny Habits recipeBJ Fogg’s anchor, behaviour, celebration.
- If-then plannerDecide when and where in advance.
- Temptation bundlingPair a “should” with a “want”.
- Habit scorecardAudit what you already do each day.
- Break a bad habitInvert the four laws into a plan.
- Morning routine builderA timed stack for the first hour.
Questions
What is the habit loop?
The habit loop describes how a habit runs: a cue triggers a craving (or anticipation of a reward), which motivates a response (the behaviour), which delivers a reward. Charles Duhigg popularised a three-step version, cue–routine–reward, in The Power of Habit (2012); James Clear’s Atomic Habits splits it into four: cue, craving, response, reward.
What is the difference between cue-routine-reward and cue-craving-response-reward?
They describe the same loop. Duhigg’s version bundles the craving into the cue and reward; Clear separates it to highlight that you respond to the anticipated reward, which gives you a fourth lever: make the habit attractive (or unattractive).
How do I change a habit loop?
Keep the cue and the reward, and swap the routine. Duhigg calls this the Golden Rule of habit change. For example, if a 3 pm biscuit is really about a break and a chat, keep the 3 pm cue and the social break, but walk to a colleague’s desk instead.
Is the habit loop scientifically accurate?
It is a simplification. Research by Wendy Wood and others describes habits as context–response associations learned through repetition and reward; once formed, the cue can trigger the behaviour even when the reward is no longer wanted. The loop is a useful design tool rather than a precise brain model.