The foundational textbook · Module 01
The Intelligence Cycle
Intelligence teams investigate a policymaker’s question by collecting, processing and analysing information, then sharing their assessment. Decision-makers review whether it answers their question; their feedback helps the teams identify what to investigate next. An assessment reduces uncertainty but does not eliminate it.
Objective: Understand how a question becomes an assessment with checked evidence and stated confidence, and why the work continues in a loop rather than ending with a report.
From question to judgment
Six phases. Continuous feedback.
Each phase below explains one part of the intelligence team’s work. Teams may revisit an earlier phase when new evidence, changing priorities or unanswered questions require further investigation.
Phase 1
Direction & Requirements
Decision-makers define the intelligence gaps they need filled to make strategic choices.
OutputA prioritised question, deadline and collection requirement
Phase 2
Collection
Collection teams gather information through complementary disciplines, such as human, signals and open-source intelligence.
OutputSource material with its origin, timing and limitations recorded
Phase 3
Processing & Exploitation
Processing specialists translate, organise and prepare collected material for analysis while preserving its original context.
OutputSearchable, intelligible material ready for analyst review
Phase 4
Analysis & Production
Analysts combine processed information into assessments that explain the evidence, alternative interpretations and uncertainty.
OutputAn evidence-based assessment with explicit reasoning and confidence
Phase 5
Dissemination
Intelligence teams deliver the assessment in a format and at a time that helps the decision-maker use it.
OutputA timely brief, report or warning with visible caveats
Phase 6
Feedback & Evaluation
Decision-makers review whether the assessment answered their question. Intelligence managers use that feedback to define what the team should investigate next.
OutputA reviewed assessment and revised priorities for the next cycle
Continue your study
The disciplines—and what surrounds them.
Human intelligence
Human nature, loyalty and the decision to share information. Explore recruitment, ideological persuasion, rapport, elicitation and the limits of reading another person.
Open chapter 02 / SIGINTSignals intelligence
Technical collection still needs interpretation.
Open chapter 03 / OSINTOpen-source intelligence
Public information. Explicit methods. Checkable conclusions.
Open chapter 04 / HISTORYBefore the modern agency
Old information problems. Changing institutions.
Open chapter 05 / PSYCHOLOGYPeople, pressure and judgment
Practical psychology without the mind-reading myths.
Open chapterThe model and its limits
This module uses six phases, with Feedback & Evaluation explicitly closing the loop. The US Intelligence Community publishes a comparable six-step model; other institutions may combine or name the phases differently. Evaluation also happens during the work.
Verification means checking evidence and testing claims. It does not make every intelligence judgment certain. Confidence describes the basis for a judgment, while likelihood describes the probability of an event. An analyst can have high confidence in an assessment that an event is unlikely.
The three collection disciplines introduced here are not exhaustive: imagery, geospatial intelligence and measurement and signature intelligence also contribute. Laws and operational arrangements vary by country. The linked agency accounts describe their own institutions; historical publications and fictional examples are labelled accordingly.
- US Intelligence Community: the six steps and intelligence products
- ODNI: assessing intelligence value and resource priorities (2016)
- NSA: signals intelligence
- NSA: operating under legal authorities
- MI5: human sources, case officers and safeguards
- Bellingcat: understanding satellite imagery
- CIA / Richards Heuer: Psychology of Intelligence Analysis
- CIA: structured analytic techniques, including ACH (2009)
- ODNI: Analytic Standards, ICD 203
- CIA: writing tips and the BLUF principle