BJ Fogg Behavior Model (B=MAP) Explained With Real-Life Examples
B=MAP explained: what motivation, ability and a prompt mean, why tiny habits clear the action line, and how to fix a habit that keeps slipping, with 8 everyday examples.
Key takeaways
- The Fogg Behavior Model (B=MAP) says a behavior happens when motivation, ability and a prompt meet at the same moment, and does not happen when one of them is missing.
- Ability means how easy a behavior is, not how good you are at it, and Fogg's 2009 paper names six factors: time, money, physical effort, mental effort, social deviance and non-routine.
- Fogg names three types of prompts: a spark when motivation is low, a facilitator when ability is low and a signal when both are already high.
- When a habit does not happen, Fogg's advice in Tiny Habits is to check the prompt first, then ability, and motivation last, because motivation is the hardest lever to move on demand.
- B=MAP explains one moment, not a lasting habit: in a 2010 study, a daily behavior took a median of 66 days to feel automatic, with estimates from 18 to 254 days.
The Fogg Behavior Model, created by Stanford behavior scientist BJ Fogg, says a behavior happens when three things meet at the same moment: motivation, ability and a prompt (B=MAP). If one is missing, nothing happens, which is why the habit you were fired up about on Monday is often gone by Thursday.
Below: what each part means, how to read the action line, 8 real-life examples taken apart, and how to use the model to make a new habit stick or to stop a bad one.
What is the Fogg Behavior Model (B=MAP)?
The Fogg Behavior Model says a behavior happens when three things meet at the same moment: motivation, ability and a prompt (B=MAP).
Definition
- B=MAP
- B=MAP stands for Behavior = Motivation, Ability, Prompt. B is the behavior, M is how much you want to do it, A is how easy it is to do, and P is the cue that tells you to do it now.
"At the same moment" is the part most explanations skip. Wanting to run on Sunday night doesn't help at 6 AM on Monday, when the bed is warm and your shoes are in the closet. All three have to show up in the same few seconds.
Who is BJ Fogg? He's a behavior scientist at Stanford, where he founded the Behavior Design Lab (formerly the Persuasive Technology Lab). BJ Fogg's behavior model first appeared in "A Behavior Model for Persuasive Design", a 2009 paper for the Persuasive '09 conference on technology that changes behavior. Later he turned the ideas into a book about everyday habits, Tiny Habits (2019). His site, behaviormodel.org, says more than 1,900 academic publications reference the model.
Trigger or prompt? The 2009 paper calls the third element a trigger, which is why older articles write the model as B=MAT and still say "trigger". Fogg's current site and Tiny Habits say prompt: same idea, newer word.
The 3 parts of B=MAP: motivation, ability and prompts
Motivation is how much you want it, ability is how easy it is, and the prompt is the nudge to do it now. Each one can be the reason a habit fails, so it helps to know them one by one.
Motivation: how much you want it right now
Motivation is your desire to do the behavior at that moment. In the 2009 paper, Fogg names three core motivators, each with two sides: pleasure and pain, hope and fear, and social acceptance and rejection. His site groups them as sensation, anticipation and belonging. The Decision Lab's guide to the model lists the same three pairs.
The catch: motivation goes up and down. You feel it after a good podcast and lose it after a bad night's sleep. That makes it the least reliable lever you have, so the model leans on the other two.
Ability: how easy it is, not how good you are
Ability isn't talent. It's how simple the behavior is for you, right now.
Fogg's 2009 paper lists six simplicity factors, and the scarcest one at that moment decides how hard the behavior feels. A habit that takes two minutes but costs $40 is still hard; so is a cheap one that takes an hour.
| Ability factor | What it means | How to make it easier |
|---|---|---|
| Time | It takes longer than you have | Cut it to 2 minutes: one page, one push-up |
| Money | It costs more than you want to spend | Use what you own: a walk instead of a new gym membership |
| Physical effort | It's tiring or uncomfortable | Lower the bar: 5 squats, not a 5K |
| Mental effort (Fogg's "brain cycles") | It takes thinking or deciding | Decide once: pick tomorrow's workout the night before |
| Social deviance | It goes against what people around you do | Do it where it's normal, or with a friend |
| Non-routine | It doesn't fit your usual day | Attach it to something you already do daily |
Prompts: the cue to do it now
A prompt tells you to act now. Fogg's page on prompts puts it plainly: without a prompt, the behavior will not happen. It names three types, and the right one depends on where your motivation and ability already are.
| Prompt type | When to use it | Everyday example |
|---|---|---|
| Spark | Low motivation, high ability: the prompt has to motivate | A friend texts "Gym in 10? I'll wait for you" |
| Facilitator | High motivation, low ability: the prompt makes it easier | Workout clothes laid out next to your bed |
| Signal | Motivation and ability both high: a reminder is enough | A calendar alert that says "Call mom" |
Tiny Habits sorts prompts a second way, by where they come from. A person prompt is you remembering on your own, which is not very reliable. A context prompt is something around you, like a sticky note or a phone alert, and too many of them fade into the background.
An action prompt is a behavior you already do, such as brushing your teeth or pouring your coffee. Fogg calls it an anchor and recommends it for new habits: it shows up every day, and nobody has to remember it for you.
The action line: why some habits happen and others don't
The action line is the curve at the heart of the BJ Fogg model: it shows how motivation and ability trade off. Picture a graph: motivation runs up the vertical axis, from low to high, and ability runs along the horizontal axis, from hard to easy. A curved line sweeps from the top left down to the bottom right.
When a prompt arrives and you're above the line, you act. When it arrives and you're below the line, you don't: you feel annoyed, or you tell yourself "I'll do it later." The 2009 paper calls the line an activation threshold; Fogg's site now calls it the Action Line.
The shape is the lesson. Hard behaviors need a lot of motivation to clear the line; easy ones clear it even on a low day. That's why tiny habits work: you make the behavior easy enough that the motivation you have is enough.
| Behavior | Ability | Motivation it needs | When the prompt comes |
|---|---|---|---|
| Run 10K at 6 AM | Hard | Very high | Below the line most mornings: you hit snooze |
| Read 10 pages before bed | Medium | Medium | Near the line: it happens on good days only |
| Do 2 push-ups after brushing your teeth | Easy | Low | Above the line: done in 10 seconds |
Our suggestion: if a habit only happens on your best days, it sits near the line. Move it to the right (make it easier) instead of trying to push yourself up.
8 real-life examples of the Fogg Behavior Model
Here are 8 real-life examples of the Fogg Behavior Model, from flossing to doomscrolling. Each one names the motivation, ability and prompt, why the behavior did or didn't happen, and the fix. The table sums them up; the details follow.
| Example | Motivation | Ability | Prompt | Fix or why it works |
|---|---|---|---|---|
| Flossing every night | Medium | Low | Weak | Floss one tooth after brushing |
| A 6 AM workout | High on Sunday, low at 6 AM | Low | The alarm | Clothes out, a 5-minute version |
| Water after the first coffee | Low is enough | High | The coffee | Fill the glass the night before |
| 10 pages before bed | Medium | Lower than the phone's | Getting into bed | Phone charges in the kitchen |
| A meditation reminder at work | Medium | Zero at that moment | Arrives at the wrong time | Move it to an anchor at home |
| Doomscrolling | Low to medium | Very high | All day long | Remove prompts, add friction |
| Journaling after brushing | Medium | High if the journal is in sight | Brushing your teeth | Journal and pen by the sink |
| One-click checkout | Medium | Very high | The buy button | Works: the design removes time and effort |
Example 1: flossing one tooth
You know you should floss. But a whole mouth at 11 PM is real effort, so it loses. Fogg's own fix, as he told WBUR in a 2020 interview, was to shrink it to one tooth and tie it to brushing: after I brush, I will floss one tooth. Ability jumps, and the toothbrush becomes the prompt.
Example 2: the morning workout that keeps losing
On Sunday night your motivation is high. At 6 AM it's low, and the workout is hard: get dressed, find your shoes, 45 minutes. The alarm is a prompt, but you're below the line.
The fix is a facilitator (clothes laid out by the bed) and a 5-minute version at home. If the hour itself is the problem, here's how to wake up early without losing sleep.
Example 3: a glass of water after your first coffee
This one usually works, and B=MAP shows why. The motivation needed is low, ability is high and the coffee is a prompt that never forgets. The only weak spot is an empty glass, so fill it the night before and leave it next to the coffee maker. When all three are there, a habit looks effortless.
Example 4: reading 10 pages with your phone on the nightstand
Getting into bed is a good prompt. The trouble is that it prompts two behaviors, and the phone is easier: no light to turn on, no page to find. The easier behavior wins.
Charge the phone in the kitchen, leave the book on your pillow and start with 2 pages. Curious how long 10 pages take at your speed? The reading time calculator works it out from your pages and reading speed.
Example 5: a meditation reminder at the wrong moment
A notification says "Time to meditate" at 2:30 PM, in the middle of a meeting. Motivation is fine and the prompt arrives, but ability is zero right then. A prompt without ability just annoys you, and after a few days you swipe it away by reflex. Move the prompt to a moment when you can act: after you park at home, sit in the car for 2 minutes.
Example 6: doomscrolling, and why it's so hard to stop
Scrolling needs almost no motivation, because ability is close to the maximum: the phone is in your hand and the feed never ends. Prompts come all day, from notifications, from boredom and from the phone just lying there. The fix runs the model backwards (see the bad habit steps below): fewer prompts, more friction. To see what your daily hours add up to over the years, try the screen time calculator.
Example 7: journaling right after brushing your teeth
Brushing your teeth is a solid anchor: daily, same place, same time. But if the journal sits in a drawer in another room, ability drops and the habit fades. Put the journal and a pen on the bathroom counter and make the habit one sentence. Same anchor, a much easier behavior.
Example 8: one-click checkout (a product example)
For the product designers reading: a one-click buy button is a facilitator, a prompt that also makes the behavior easier. The motivation to buy is already there, and the button removes the time and mental effort of a checkout form, so the purchase clears the action line.
How to use B=MAP to build a new habit (step by step)
To build a habit with B=MAP, pick a behavior you actually want, shrink it until it's almost too easy and attach it to a prompt you already meet every day. When it doesn't happen, check the prompt first, then ability, and motivation last.
Pick a behavior you really want
Not one you think you should want. Motivation is unreliable, but you still need some. "Read a chapter of a novel before bed" beats "read the business book everyone at work talks about."
Make it tiny
Our suggestion: cut it until it takes a minute or two on your worst day, like one push-up, one sentence or one page. If it feels almost too small to count, you're close.
Attach it to an anchor
Write the recipe: "After I [anchor], I will [tiny behavior]." That's an if-then plan, and a 2006 meta-analysis by Peter Gollwitzer and Paschal Sheeran pooled 94 independent tests and found that such plans had a medium to large effect on reaching goals (d = 0.65). For 40 ready-made examples, see our guide to habit stacking.
Celebrate right after
Tiny Habits ends the recipe with a celebration: a quick "Yes!", a fist pump, a smile, whatever gives you a small good feeling. In the book, Fogg argues that this feeling, more than repetition, is what wires in a habit. Repetition matters too (more below).
If it doesn't happen, debug it in this order
This is Fogg's own troubleshooting order in Tiny Habits: prompt first, ability second, motivation last. The first two are levers you can change tonight. Motivation is the hardest to move on demand, which is why his method rests on the anchor and the tiny behavior instead.
Steps 2 to 4 are Fogg's ABC recipe: Anchor, Behavior, Celebration. In B=MAP terms (our reading), the anchor is your prompt, the tiny behavior keeps ability high and the celebration adds a good feeling on the motivation side.
| Question | If the answer is no | Fix |
|---|---|---|
| Did a prompt happen? | You simply forgot | Pick a sharper anchor: the last moment of something you already do |
| Was it easy enough? | You remembered, then skipped it | Shrink it, or fix the hardest ability factor from the table above |
| Did you want it? | Prompted and easy, still skipped | Swap it for a behavior you want, or pair it with something you enjoy |
Your B=MAP habit planner
Print this page or copy the planner into a notebook. Fill in the right column for one habit, and look at it again after a week.
| Part | Example | Your habit |
|---|---|---|
| The behavior I want | Stretch every morning | ______________ |
| Tiny version (a minute or two) | One hamstring stretch | ______________ |
| Anchor (After I...) | After I start the coffee maker | ______________ |
| Celebration | A smile and "Nice." | ______________ |
| Hardest ability factor and my fix | Mental effort: the same stretch every day | ______________ |
| After one week: prompt, ability or motivation? | Prompt worked; ability fine | ______________ |
To tick it off each day, our habit tracker gives you monthly and weekly views and a year heatmap per habit in the browser, saved in the page link, with nothing stored.
How to use B=MAP to break a bad habit
To break a bad habit with B=MAP, run the model backwards: remove the prompt, make the behavior harder, and only then work on how much you want it. It's tempting to start with willpower, but that's the lever you control least.
Remove the prompt
Turn off notifications from the apps that pull you in. Put the snacks in a cupboard instead of on the counter. No prompt, no behavior.
Make it harder
Lower the ability: charge your phone in another room, move the app off your home screen, log out so getting back in takes a password.
Lower the pull
Then motivation, the hardest lever of the three. Name what the habit costs you, and give the urge somewhere to go. For ideas, here are 50 bad habits and what to replace each one with.
Worked example
Sam, a fictional example, scrolls for an hour in bed most nights. Here's the same habit with all three changes.
- The prompt. The phone lights up on the nightstand. Sam silences notifications after 9:00 PM.
- The ability. The charger moves to the kitchen and a cheap alarm clock takes the phone's spot.
- The pull. A novel waits on the pillow, and Sam reads 2 pages instead. Some nights the urge is still there, but now it takes a walk to the kitchen.
Fogg Behavior Model vs the habit loop, Atomic Habits and COM-B
B=MAP explains one moment: why a behavior happens now or not. The habit loop explains repetition: why a behavior keeps coming back. They answer different questions, so they work well together. Atomic Habits turns similar ideas into a checklist, and COM-B is the bigger framework researchers use to design programs.
| Model | Core idea | Best for | Main limitation |
|---|---|---|---|
| Fogg Behavior Model (B=MAP) | Behavior happens when motivation, ability and a prompt meet at the same moment | Finding out why one behavior did or didn't happen | Says little about how a behavior becomes automatic over time |
| The habit loop | A cue, a craving, a response and a reward repeat until the behavior runs on its own | Understanding why a habit keeps coming back | Doesn't tell you why a new behavior fails the first time |
| Atomic Habits' four laws (James Clear) | Make it obvious, attractive, easy and satisfying | A practical checklist for building or breaking a habit | A book's playbook, not a model tested as a whole |
| COM-B (Michie and colleagues, 2011) | Behavior needs capability, opportunity and motivation | Planning health programs and larger interventions | More parts to learn, built for program designers more than for your Tuesday morning |
Our explainer of the habit loop walks through cue, craving, response and reward with examples. James Clear's laws line up with Fogg in two places: make it obvious is the prompt, and make it easy is ability. The rest is on our Atomic Habits cheat sheet.
COM-B comes from a 2011 paper by Susan Michie, Maartje van Stralen and Robert West in Implementation Science, where it sits at the hub of their Behaviour Change Wheel, a method for designing interventions.
Limitations and criticism of the Fogg Behavior Model
One common criticism is that B=MAP is a useful way to think, not a proven law of behavior. It's simple on purpose, and the simplicity costs detail. Use it to diagnose a habit, not as the whole story.
- Motivation is one big word. COM-B splits it into reflective motivation (plans and beliefs) and automatic motivation (emotions, impulses and habits); B=MAP does not.
- The environment hides inside ability. In COM-B it gets its own letter: opportunity, physical and social.
- The action line is a picture, not a measurement. Nobody can plot exactly where your 6 AM run sits. The curve shows a proposed relationship, not a threshold measured for each person.
- It works for whoever uses it. Fogg first described the model for persuasive technology, and the same logic that helps you floss can help an app keep you scrolling: an endless feed raises ability, and notifications supply the prompts. Knowing B=MAP helps you spot when a design is working on you.
And one moment isn't a habit: B=MAP gets you to day 1, and repetition does the rest. In a 2010 study that followed 96 volunteers, Phillippa Lally and colleagues found a median of 66 days for a daily behavior to feel automatic, among participants whose data fit their model, with estimates from 18 to 254 days. That's a median from one study, not a deadline. Our guide to habit formation covers the whole process, from the first prompt to an automatic habit.
The gap between a fired-up start and a daily habit is also why most New Year's resolutions fail: plenty of motivation, no tiny version and no prompt to carry it.
Putting B=MAP into a daily routine
A routine is B=MAP on repeat. When habits run in a fixed order, each finished habit becomes the prompt for the next, so you need one anchor for the whole chain, not five.
Keep every habit small in minutes: 2 minutes of meditation, 5 minutes of reading, 10 squats. Small keeps ability high on a bad day. Then make the reward visible, so motivation gets a small push each day you show up.
That's how we designed Greatr. You build a morning or evening routine, tap Play and run your habits one at a time in the same order. Every habit earns XP, and Otto, the app's guide, keeps count of every day you show up in his notebook. If your phone is the competing prompt, the apps you choose stay locked until the routine is done.
Do the smallest version today. Tomorrow we build on it.
Not sure which habit to start with? Pick one from our 100+ good habits examples, organized by life area.
Your next step, tonight: write one recipe, "After I [anchor], I will [tiny behavior]", and decide how you'll celebrate. Tomorrow, do it once, right after the anchor.
Frequently asked questions
What does B=MAP stand for?
B=MAP stands for Behavior = Motivation, Ability, Prompt. It is BJ Fogg's shorthand for his behavior model: a behavior happens when you want to do it, it is easy enough to do and something prompts you to do it now, all at the same moment. If one of the three is missing, the behavior does not happen.
What are the three elements of the Fogg Behavior Model?
The three elements are motivation, ability and a prompt. Motivation is how much you want to do the behavior at that moment. Ability is how easy it is, shaped by time, money, physical effort, mental effort, social deviance and how routine it is. A prompt is the cue that tells you to act now, such as an alarm or a habit you already have.
What is the action line in the Fogg Behavior Model?
The action line is the curve on Fogg's graph of motivation (the vertical axis) against ability (the horizontal axis). When a prompt arrives and you are above the line, you act; below it, you do not. Hard behaviors need high motivation to clear the line, while easy ones clear it even on a low day, which is why tiny habits are so reliable.
What are the three types of prompts?
BJ Fogg names three types of prompts: a spark, a facilitator and a signal. A spark adds motivation when the behavior is easy but you do not feel like it. A facilitator makes the behavior easier when you want to do it but it is hard. A signal is a plain reminder for when motivation and ability are both already high.
What is the difference between a trigger and a prompt in Fogg's model?
There is no real difference in meaning. In his 2009 paper, BJ Fogg called the third element of the model a trigger. His current site, behaviormodel.org, and his book Tiny Habits use the word prompt for the same thing: the cue that tells you to do the behavior now. Older articles about the model still use the word trigger.
How is the Fogg Behavior Model different from the habit loop?
The Fogg Behavior Model explains one moment: why a behavior happens now or not, based on motivation, ability and a prompt. The habit loop explains repetition: a cue, a craving, a response and a reward that repeat until a behavior runs on its own. B=MAP helps you start a behavior, and the loop explains why it keeps coming back.
What is the main criticism of the Fogg Behavior Model?
A common criticism is that B=MAP is a practical thinking tool rather than a well-tested law of behavior. A 2025 scoping review found only six studies of health interventions built on it that met its criteria, and called for more rigorous research. The model also does not separate deliberate from automatic motivation, and it hides the environment inside ability, both of which COM-B separates.
How is B=MAP used in Tiny Habits?
Tiny Habits turns B=MAP into a recipe: after I [anchor], I will [tiny behavior], then celebrate. The anchor, a habit you already do, is the prompt. Making the behavior tiny keeps ability high, so a little motivation is enough. The celebration is a small positive feeling right after the behavior, which Fogg argues is what wires in the new habit.
Sources
- About Us
- A behavior model for persuasive design
- Tiny Habits: The Small Changes That Change Everything
- Fogg Behavior Model
- Fogg Behavior Model
- Fogg Behavior Model: Prompts
- Trying To Form A New Habit? Start Small, Says BJ Fogg
- Implementation Intentions and Goal Achievement: A Meta-analysis of Effects and Processes
- SAMHSA's National Helpline
- The behaviour change wheel: A new method for characterising and designing behaviour change interventions
- Behavioral science meets public health: a scoping review of the Fogg behavior model in behavior change interventions
- How are habits formed: Modelling habit formation in the real world
About this article
Jip Groen is a co-founder of Greatr who writes about routines, mornings and screen time: reading the research carefully, trying it on real mornings and turning it into one step you can take tomorrow.
Read full bioHow we wrote this
Jip Groen wrote this guide from the studies and sources listed above, linked so you can check them. Greatr is our own app: we mention it where it fits, and it never decides what a study says. Published Nov 5, 2026. Read our editorial policy.
