Cognitive Biases - Psychology for Product Design
Understanding psychological patterns that influence human decision-making, first systematically studied by Kahneman and Tversky. Essential for creating user experiences that work with human psychology.
When to Use This Skill
- Designing user onboarding flows
- Improving conversion rates ethically
- Analyzing why users behave unexpectedly
- Reviewing designs for dark patterns
- Planning pricing and positioning strategies
- Understanding decision-making in user research
Core Biases at a Glance
| Bias | What It Is | Application |
|---|
| Anchoring | First info becomes reference point | Show premium prices first |
| Loss Aversion | Losses feel 2x stronger than gains | Frame as "losing" vs "missing" |
| Availability | Overestimate what's easy to recall | Show success stories, social proof |
| Confirmation | Seek info confirming beliefs | Personalize onboarding |
| Planning Fallacy | Underestimate task duration | Give realistic time estimates |
| Framing Effect | Presentation changes perception | Use positive framing |
| Sunk Cost | Invest based on past costs | Highlight accumulated value |
| Social Proof | Look to others for guidance | Show testimonials, usage stats |
| Scarcity | Value rare things more | Use genuine limited offers |
Progressive Disclosure
Ethical Framework
Before applying a bias, ask:
1. Is this helping the user? → STOP if NO
2. Would I be comfortable if exposed? → STOP if NO
3. Does this create long-term value? → STOP if NO
4. Would this work on an informed user?
→ YES (persuasion) / NO (manipulation)
Quick Reference
Acquisition:
├── Social Proof → "Join 50,000+ users"
├── Anchoring → Show premium first
└── Scarcity → "Limited beta access"
Activation:
├── Commitment → Small first steps
├── Planning Fallacy → Realistic estimates
└── Loss Aversion → Show progress at risk
Retention:
├── Sunk Cost → "Your history, connections"
├── Confirmation → Personalized experience
└── Social Proof → "Your team uses this"
References
