Actively search for what you are not thinking about

The risks and options you cannot easily recall are at least as real as the ones you can.

Why it works

The availability heuristic makes invisible things feel nonexistent: if an option, risk, or alternative does not come easily to mind, it tends to be excluded from consideration. This is not because it is unlikely — it is because it is not represented in your information environment or has not been activated recently. Actively asking "what am I not thinking about?" counteracts the selective retrieval that availability produces.

How to do it

1. After generating your initial analysis or option list, pause and ask: "What would be on this list if I had completely different experiences and information?"
2. Ask someone with a different background what they would add.
3. Review a structured checklist of common overlooked categories (e.g., second-order risks, silent stakeholders, neglected failure modes).
4. Give deliberate attention to the "slow," undramatic threats that rarely appear in news — they are often the real risks.

Evidence

The "unpacking effect" (Tversky & Koehler, 1994) demonstrates that explicitly unpacking a category into its parts increases the probability assigned to the whole — showing that what is not actively retrieved is systematically underweighted. Actively searching the neglected reverses this. (observational)

The unpacking principle means actively enumerating items increases perceived probability — a useful corrective but also a reminder that the practice can overcorrect if applied indiscriminately.

Sources

• Tversky & Koehler (1994), support theory: a nonextensional representation of subjective probability, Psychological Review
• Tversky, A., & Koehler, D. J. (1994). Support theory: A nonextensional representation of subjective probability. Psychological Review, 101(4), 547–567.

Common mistake

Conducting "what am I missing?" as a brief mental scan rather than as a structured search — the heuristic ensures the most neglected items remain most neglected even under this question.