Psychology & Behavior
Inside View vs Outside View
內外部視角切換 · Source: Daniel Kahneman / Amos Tversky
Planning and forecasting — especially when you're overly optimistic about your own project, goals, or capabilities
Core Concept
"Inside view" is your perspective on your specific situation, usually full of optimism and detail. "Outside view" asks statistically: how do things like this typically go? The most effective approach: start with the outside view base rate, then make limited adjustments for your specifics.
✓ When to use this
When estimating project timelines/costs, predicting new venture success, or evaluating your "this time is different" reasoning. When you catch yourself saying "but our situation is special," that is the signal to switch.
✗ When not to use this
Genuinely unprecedented situations (no comparable outside reference) can only use the inside view. Decisions with solid historical data do not need to switch — use the base rate directly.
Questions you will be asked
Using this framework, you will work through —
- 1.What is your plan or decision?
- 2.Inside view: What are your expected timelines, costs, and success rate?
- 3.Outside view: How do similar plans typically turn out?
- …and 3 more
Related Frameworks
Psychology & Behavior
Base Rate Forecasting
Decisions requiring outcome forecasts — from startup success rates to investment returns, start by asking "how does this type of thing typically go"
Psychology & Behavior
Cognitive Bias Checklist
Pre-flight check before any important decision — scan for five high-frequency biases before you commit