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
