Key Assumptions Check¶
Why It Matters¶
Most analytical failures stem from unstated assumptions that turn out to be wrong. The Iraq WMD assessment assumed that Saddam Hussein's behavior (blocking inspectors, appearing to hide something) meant he had WMD. The hidden assumption: rational actors don't risk invasion to hide non-existent weapons. The assumption was wrong - he was bluffing to maintain domestic authority and regional deterrence.
The Key Move¶
Force yourself to complete the sentence: "This analysis only works if..." Distinguish supporting assumptions (if wrong, conclusions weaken) from linchpin assumptions (if wrong, conclusions collapse). For each linchpin assumption, ask: How confident am I? What's my evidence? What could make it wrong? Then actively seek information that tests critical assumptions rather than confirms conclusions.
Classic Application¶
Cuban Missile Crisis analysis. U.S. intelligence assumed Soviet strategic doctrine wouldn't accept significant overseas deployment of nuclear weapons. Challenging this assumption - "What if Soviet doctrine has changed?" - led to earlier detection of the deployment and recognition of its strategic significance.
Surprising Application¶
Product development strategy. A startup assumed "users want more features." Explicitly testing this assumption through interviews revealed users actually wanted simpler, more reliable core functionality. The hidden linchpin assumption - that feature quantity drives adoption - was false. Challenging it redirected the entire product roadmap.
Failure Modes¶
Listing only obvious assumptions while missing hidden ones (get others to review your list). Identifying assumptions but not testing them (the check requires action, not just listing). Assuming your assumptions are shared by adversaries or other actors (mirror-imaging). Treating all assumptions as equally critical (focus on linchpins). Becoming paralyzed by uncertainty after revealing assumptions (the point is to test, not to achieve certainty).
Go Deeper¶
Heuer, "Psychology of Intelligence Analysis" Chapter 8. Pherson and Heuer, "Structured Analytic Techniques for Intelligence Analysis" (2nd ed.), Chapter 5. U.S. Government's "Tradecraft Primer: Structured Analytic Techniques for Improving Intelligence Analysis" (2009).