WYSIATI (What You See Is All There Is)

Kahneman's acronym for the mind's tendency to construct the best possible story from available information—without considering what information is MISSING. When you read a one-sided argument, it feels compelling because your brain treats the available evidence as complete. When you evaluate a job candidate based on an interview, your brain constructs a coherent impression from the interview data alone, ignoring the vast amount of information you don't have. WYSIATI explains overconfidence: your confidence reflects the coherence of the story you can construct, not the quality or completeness of the underlying information.

When to use it

When decisions feel obvious and confidence is high (that's exactly when WYSIATI is most dangerous); when evaluating people, plans, or opportunities based on limited information; when one-sided arguments feel compelling; when designing decision processes that need to account for information gaps.

How it can help

For every important judgment, ask: what information am I NOT seeing? WYSIATI means your confidence naturally reflects how well the available evidence fits together—not whether you have enough evidence. A coherent story from incomplete data feels just as convincing as a coherent story from complete data. Countermeasures: always ask 'what's missing from this picture?' before deciding. Seek disconfirming evidence. Get perspectives from people who have different information than you. Use checklists to ensure you're considering standard information categories, not just what's salient.