Intelligence Analysis · INT-01

Analysis of Competing Hypotheses

The structured method that keeps bias out of threat assessment, vetting decisions, and operational analysis.

What This Course Is

ACH is the method the intelligence community uses to prevent analysts from quietly confirming what they already believe. Developed by CIA analyst Richards Heuer and documented in FM 2-0, it works by inverting the normal analytical procedure: instead of building a case for the most plausible explanation, you build a case against every explanation simultaneously and identify the one that has been least contradicted. This course teaches the complete eight-step process, the reasoning behind it, and how to apply it to community security decisions — vetting, threat assessment, and anomaly evaluation — without professional intelligence infrastructure.

Start the Course → Lesson 0: Why ACH Exists

The Five Lessons

Work in sequence. Each lesson builds on the previous one. Lesson 4 is a complete applied scenario that requires the concepts from Lessons 0 through 3.

INT-01-00Course Introduction: Why ACH Exists
Confirmation bias, anchoring, availability bias, mirror imaging, and groupthink — the failure modes ACH is designed to prevent, explained through the analytical problems they cause in practice.
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INT-01-01The Three Core Principles
Disconfirmation over confirmation. Row-reading over column-reading. A hypothesis set that does not have the answer missing before the analysis begins. If you understand these three, you understand the method.
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INT-01-02Building the Matrix — Steps 1 Through 4
Framing the question, compiling evidence including assumptions and absences, marking every cell by reading across the rows, and refining the matrix to remove evidence that cannot discriminate between hypotheses.
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INT-01-03Reading the Matrix — Steps 5 Through 8
Drawing conclusions from inconsistency counts, stress-testing fragile evidence, reporting all surviving hypotheses with stated confidence, and defining indicators for what to watch next.
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INT-01-04Applied Scenario and Common Pitfalls
All eight steps worked through a community security scenario with five hypotheses — including the deception hypothesis — plus the six failure modes that most commonly turn a structured process into a structured rationalization.
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How each lesson works

Doctrine first. Every concept is grounded in its source: Heuer’s Psychology of Intelligence Analysis, FM 2-0, and the CIA Tradecraft Primer. You learn why the method works, not just what the steps are.

Application second. Each lesson translates the concept to the preparedness context — vetting candidates, evaluating anomalies, assessing threats — with case studies drawn from realistic community security scenarios.

Knowledge checks throughout. Interactive questions test application, not recall. Correct answers include the full reasoning. Incorrect answers direct you back to the relevant section.

Prerequisites and Sequencing

No prior intelligence background is required. This course is self-contained. If you have completed INT-04 Elicitation Tradecraft, you will recognize the community security context and the doctrinal framing — INT-01 extends that analytical foundation. INT-01 is a prerequisite for future INT-series courses covering Pattern of Life Analysis and HUMINT Network Building.

Intelligence Analysis Series

Part of the INT Track

INT-01 is one course in the Intelligence Analysis track. The full track covers structured analytic techniques, radio traffic analysis, source handling, elicitation tradecraft, and pattern of life analysis — the complete analytical toolkit for community-level intelligence work.

View the Full INT Track →

Fortune Favors the Prepared · INT-01 · For Member Use Only