# Fogg Behavior Model The Fogg Behavior Model, developed by [[BJ Fogg]] at Stanford's Behavior Design Lab, states that behavior occurs when three elements converge simultaneously: **Motivation** (desire to act), **Ability** (capacity to act), and **Prompt** (trigger to act). Expressed as **B = MAP**, the model explains why behaviors happen—or fail to happen. If any element is missing or insufficient, the behavior won't occur. A person might be highly motivated to exercise but lack ability (no gym access) or prompt (no reminder). The model provides a diagnostic framework: when a behavior isn't happening, identify which element is weak. The key insight is that **ability often matters more than motivation**. Motivation fluctuates and is hard to sustain, but making behaviors easier (reducing [[Friction]]) produces more reliable change. Fogg's [[Tiny Habits]] method applies this: shrink the behavior until ability is trivially high, then motivation barely matters. The model also reveals why [[Persuasive Technology]] works—apps succeed by making behaviors easy (one-click) and providing timely prompts (notifications). For [[Behavioral Design]], the order of intervention should be: first ensure prompts exist, then maximize ability, then boost motivation only if needed. ## The Model Visualized ``` ┌─────────────────────────────────────────────────────────────┐ │ FOGG BEHAVIOR MODEL: B = MAP │ ├─────────────────────────────────────────────────────────────┤ │ │ │ Motivation │ │ (High) │ │ │ │ ┌─────────────────────────────────────┐ │ │ │ │ │ │ │ │ │ PROMPTS SUCCEED HERE │ │ │ │ │ (Behavior happens) │ │ │ │ │ │ │ │ │────┼─────────────────────────────────────│ │ │ │ │ ACTION LINE │ │ │ │────┼─────────────────────────────────────│ │ │ │ │ │ │ │ │ │ PROMPTS FAIL HERE │ │ │ │ │ (Behavior doesn't happen) │ │ │ │ │ │ │ │ (Low) │ └─────────────────────────────────────┘ │ │ └──────────────────────────────────────────► │ │ (Hard) Ability (Easy) │ │ │ │ When M × A is above the action line, a prompt triggers │ │ behavior. Below the line, prompts fail. │ │ │ │ KEY: It's often easier to increase ABILITY than │ │ MOTIVATION. Make the behavior smaller/easier. │ │ │ └─────────────────────────────────────────────────────────────┘ ``` ## The Three Elements | Element | Description | Sub-components | |---------|-------------|----------------| | **Motivation** | Desire to perform behavior | Pleasure/pain, hope/fear, acceptance/rejection | | **Ability** | Capacity to perform behavior | Time, money, effort, mental load, routine fit | | **Prompt** | Trigger that calls to action | Person prompts, context prompts, action prompts | ## Motivation Sources (Fogg) | Motivator | Dimension | |-----------|-----------| | **Sensation** | Pleasure ↔ Pain | | **Anticipation** | Hope ↔ Fear | | **Social** | Acceptance ↔ Rejection | ## Ability Factors (Simplicity Chain) | Factor | Question | |--------|----------| | **Time** | Do I have time? | | **Money** | Can I afford it? | | **Physical effort** | Is it physically demanding? | | **Mental effort** | Is it cognitively hard? | | **Social deviance** | Is it socially acceptable? | | **Routine** | Does it fit my current habits? | ## Types of Prompts | Type | Description | Example | |------|-------------|---------| | **Spark** | High ability, low motivation | Inspirational video | | **Facilitator** | High motivation, low ability | Step-by-step guide | | **Signal** | High motivation, high ability | Simple reminder | ## Applying the Model | If Behavior Doesn't Happen... | Intervention | |------------------------------|--------------| | **No prompt** | Add a trigger | | **Low ability** | Make it easier, reduce friction | | **Low motivation** | Connect to core motivators | | **Competing behaviors** | Remove or weaken them | ## Design Sequence (Fogg's Recommendation) ``` 1. CHECK PROMPT → Does a trigger exist at the right moment? ↓ 2. MAXIMIZE ABILITY → Can you make the behavior easier? ↓ 3. BOOST MOTIVATION → Only if steps 1-2 aren't sufficient ``` ## B=MAP vs Other Models | Model | Focus | |-------|-------| | **Fogg (B=MAP)** | M × A × P must converge | | **COM-B** | Capability, Opportunity, Motivation | | **Transtheoretical** | Stages of readiness | | **[[Nudge Theory]]** | Choice architecture | ## Examples | Behavior | Motivation | Ability | Prompt | |----------|------------|---------|--------| | **Flossing** | Moderate (health) | Low (takes time) | After brushing | | **Instagram** | High (social) | Very high (one tap) | Notification | | **Exercise** | Variable | Low (effort, time) | Gym clothes visible | | **Reading** | Moderate | Depends on access | Book on nightstand | ## Tiny Habits Application | Traditional | Tiny Habits (B=MAP) | |-------------|---------------------| | "Exercise 30 min" | "2 pushups after bathroom" | | High motivation needed | Ability maxed, motivation irrelevant | | Often fails | Consistently succeeds | ## Key Insights | Insight | Implication | |---------|-------------| | **Motivation is unreliable** | Don't depend on it | | **Ability is underrated** | Make behaviors tiny | | **Prompts must be timely** | Right moment matters | | **All three required** | Missing one = no behavior | | **Order matters** | Prompt → Ability → Motivation | ## References - Fogg, BJ. *[[Tiny Habits]]* (2019) - Fogg, BJ. "A Behavior Model for Persuasive Design" (2009) - https://behaviormodel.org/ - Stanford Behavior Design Lab ## Related - [[BJ Fogg]] - [[Tiny Habits]] - [[Behavior Change]] - [[Behavioral Design]] - [[Friction]] - [[Environment Design]] - [[Habit Formation]] - [[Persuasive Technology]] - [[Nudge Theory]] - [[Motivation (MoC)|Motivation]] - [[Atomic Habits]]