# Friction Friction in behavioral design refers to the obstacles, steps, or effort required to perform a behavior—and the insight that tiny changes in friction have outsized effects on whether behaviors occur. [[Wendy Wood]]'s research shows that moving snacks just 6 feet away reduces consumption by 50%—not because desire changes, but because the small inconvenience tips the balance. [[BJ Fogg]]'s [[Fogg Behavior Model]] captures this as the "Ability" dimension: when friction is low, even weak motivation produces action; when friction is high, even strong motivation fails. The principle underlies [[Environment Design]], [[Nudge Theory]], and [[Behavioral Design]]: rather than changing minds, change the path. [[James Clear]] calls friction "the invisible hand that shapes behavior." Tech companies understand this deeply—one-click purchasing, infinite scroll, and frictionless sharing are designed to remove barriers to engagement. The same principle works in reverse: adding friction (website blockers, keeping phone in another room, cooling-off periods) makes undesired behaviors less likely. Friction manipulation is often more effective than motivation or willpower because it operates at the moment of decision, when even small obstacles loom large. ## Friction's Impact on Behavior ``` ┌─────────────────────────────────────────────────────────────┐ │ FRICTION AND BEHAVIOR │ ├─────────────────────────────────────────────────────────────┤ │ │ │ HIGH FRICTION LOW FRICTION │ │ ┌─────────────────────┐ ┌─────────────────────┐ │ │ │ ████████████████ │ │ ██ │ │ │ │ │ │ │ │ │ │ Many steps │ │ Few/no steps │ │ │ │ Inconvenient │ │ Convenient │ │ │ │ Requires effort │ │ Effortless │ │ │ │ Takes time │ │ Instant │ │ │ └──────────┬──────────┘ └──────────┬──────────┘ │ │ │ │ │ │ ▼ ▼ │ │ ┌─────────────────────┐ ┌─────────────────────┐ │ │ │ BEHAVIOR UNLIKELY │ │ BEHAVIOR LIKELY │ │ │ │ │ │ │ │ │ │ Even with high │ │ Even with low │ │ │ │ motivation │ │ motivation │ │ │ └─────────────────────┘ └─────────────────────┘ │ │ │ │ WOOD'S SNACK STUDY: │ │ ┌─────────────────────────────────────────────────────┐ │ │ │ On desk: 100% consumption baseline │ │ │ │ 6 feet away: 50% reduction │ │ │ │ 20 feet away: Even greater reduction │ │ │ │ │ │ │ │ Same desire. Different friction. Different behavior.│ │ │ └─────────────────────────────────────────────────────┘ │ │ │ └─────────────────────────────────────────────────────────────┘ ``` ## Types of Friction | Type | Description | Example | |------|-------------|---------| | **Physical** | Distance, movement required | Gym proximity affects usage | | **Temporal** | Time required | 30-second delay reduces impulse | | **Cognitive** | Mental effort, complexity | Confusing forms reduce completion | | **Financial** | Cost, payment friction | Removing saved cards reduces spending | | **Social** | Social awkwardness | Public commitment increases follow-through | | **Technical** | Steps, clicks, logins | Password requirements add friction | ## Friction Manipulation Strategies | Goal | Strategy | Example | |------|----------|---------| | **Build good habit** | Reduce friction | Gym clothes by bed | | **Break bad habit** | Add friction | Delete social media apps | | **Encourage action** | Remove steps | One-click purchase | | **Discourage action** | Add steps | Cooling-off periods | | **Make default** | Zero friction | Opt-out organ donation | | **Prevent default** | Add active choice | Cookie consent | ## Friction in Product Design | Low Friction (Encourages Use) | High Friction (Discourages) | |------------------------------|----------------------------| | One-click purchase | Multi-step checkout | | Infinite scroll | Pagination | | Auto-play next video | Manual selection | | Saved passwords | Login each time | | Pre-filled forms | Blank forms | | Default opt-in | Active consent | ## Research Evidence | Study | Finding | |-------|---------| | **Snack distance** ([[Wendy Wood]]) | 6 feet = 50% less consumption | | **Cafeteria layout** | Eye-level placement increases selection 25% | | **Gym distance** | Each mile reduces visits significantly | | **Default retirement** | Opt-out enrollment: 90%+ participation | | **Organ donation** | Opt-out countries: 85-99% vs 4-27% | | **Checkout friction** | Each added step loses 10% of customers | ## Friction in the Fogg Behavior Model ``` ┌─────────────────────────────────────────────────────────────┐ │ B = M × A × P (Fogg Model) │ ├─────────────────────────────────────────────────────────────┤ │ │ │ Motivation │ │ │ (High) │ ┌───────────────────────────────────┐ │ │ │ │ │ │ │ │ │ BEHAVIOR HAPPENS │ │ │ │ │ (above the line) │ │ │ │ │ │ │ │ │────┴───────────────────────────────────│ │ │ │ Action Line │ │ │ │────┬───────────────────────────────────│ │ │ │ │ │ │ │ │ │ BEHAVIOR DOESN'T HAPPEN │ │ │ │ │ (below the line) │ │ │ (Low) │ └───────────────────────────────────┘ │ │ └────────────────────────────────────────► │ │ (Hard) Ability (Easy) │ │ HIGH FRICTION ◄──► LOW FRICTION │ │ │ │ KEY INSIGHT: Reducing friction (moving right) is often │ │ easier than increasing motivation (moving up) │ │ │ └─────────────────────────────────────────────────────────────┘ ``` ## Practical Applications | Domain | Reduce Friction For | Add Friction For | |--------|---------------------|------------------| | **Health** | Exercise, healthy food | Junk food, smoking | | **Finance** | Saving, investing | Impulse purchases | | **Productivity** | Deep work, important tasks | Distractions, social media | | **Learning** | Study materials access | Entertainment | | **Relationships** | Connection, communication | Conflict triggers | ## Friction Audit Questions | Question | Purpose | |----------|---------| | How many steps does this take? | Identify reduction opportunities | | What obstacles exist? | Find friction points | | What's the path of least resistance? | Understand current defaults | | Where do people drop off? | Find friction barriers | | What would make this effortless? | Design ideal state | ## Friction vs Motivation | Approach | Method | Sustainability | |----------|--------|----------------| | **Motivation-based** | Inspire, persuade, remind | Fluctuates, depletes | | **Friction-based** | Redesign environment | Consistent, automatic | | **Best approach** | Combine both | Motivation starts, friction sustains | ## References - Wood, Wendy. *[[Good Habits, Bad Habits]]* (2019) - Fogg, BJ. *[[Tiny Habits]]* (2019) - Clear, James. *[[Atomic Habits]]* (2018) - Thaler & Sunstein. *Nudge* (2008) ## Related - [[Wendy Wood]] - [[BJ Fogg]] - [[Fogg Behavior Model]] - [[Environment Design]] - [[Habit Formation]] - [[Behavioral Design]] - [[Nudge Theory]] - [[Good Habits, Bad Habits]] - [[Tiny Habits]] - [[Atomic Habits]] - [[James Clear]] - [[Decision Making]]