Fogg Behavior Model

Behavior happens when motivation, ability, and prompt meet at same moment. If behavior fails, one element is missing.

Goal

• Define target behavior.
• Find weak element.
• Design intervention.
• Measure behavior change.

Elements

• Motivation: user wants to act.
• Ability: action is easy enough.
• Prompt: trigger appears at the right moment.

Ability factors

• Time.
• Money.
• Physical effort.
• Mental effort.
• Social risk.
• Routine fit.

Ability is limited by hardest factor.

Rules

• Define behavior specifically.
• Start by improving ability when unsure.
• Make action smaller before adding persuasion.
• Prompt only when user can act.
• Avoid interruptive prompts.
• Measure actual behavior, not intent.

Flow

1. Define target behavior: who, what, when, frequency.
2. Score motivation, ability, prompt from 1-5.
3. Find bottleneck.
4. Break down ability factors.
5. Choose intervention.
6. Define success metric.

Resources

• BJ Fogg's Behavior Model
• Tiny Habits - BJ Fogg
• Hooked - Nir Eyal
• Atomic Habits - James Clear

Output

## Behavior Analysis

Target behavior: [specific action]
User segment: [who]

## Scores
- Motivation: [1-5] - [evidence]
- Ability: [1-5] - [evidence]
- Prompt: [1-5] - [evidence]

## Bottleneck
- [motivation | ability | prompt]

## Intervention
- [specific change]

## Success Metric
- [behavior rate and target]