“Warning is an intangible, an abstraction, a theory, a deduction, a perception, a belief. It is the product of reasoning or of logic, a hypothesis whose validity can be neither confirmed nor refuted until it is too late.”Cynthia M. Grabo (Joint Military Intelligence College) · Anticipating Surprise: Analysis for Strategic Warning · 2002 · Cynthia M. Grabo, «Anticipating Surprise: Analysis for Strategic Warning» (Joint Military Intelligence College, 2002), secțiunea «What Is Warning?» — «Warning Is Not a Commodity», p. 4
The indicator is what you expect to see; the indication is what you actually see.
Grabo wrote the text in the early 1970s as a classified textbook for warning analysts, drawing on some twenty-five years of experience. The US Defense Intelligence Agency published it in three classified volumes between 1972 and 1974, and the Joint Military Intelligence College later published the declassified, condensed version. Her starting distinction is the one non-specialists most often miss: an indicator is a known or theoretical step the adversary should or may take in preparing for hostilities — something anticipated and put on a watch list. An indication is information that the step is actually being taken. The method works in three moves: build the indicator list in advance for the scenario that worries you (a call-up of reservists, a deployment of forces, a military alert), track what gets ticked off, and judge the pattern rather than isolated pieces. The warning judgement concerns the probability of action, not its imminence, and it can come weeks or months ahead. It pays off wherever surprise is very costly and the adversary's preparations leave traces. The trap is treating warning as a commodity you either have or lack. It is a hypothesis, so it has to be issued before certainty arrives.
An indicator list does more than help you notice; it stops you from interpreting at will. Without it, the same sign means whatever anyone wants: a noise at night is “just the cat” or “an intruder,” depending on your mood. With a list written in advance, each sign is placed beside other signs, not beside your disposition. Grabo implies the real work happens before the crisis, when no one is under pressure. That is when you can calmly spell out what would mean preparations have begun. Which raises a practical question: who writes the list, and when?
Why it matters Without an indicator list written before the crisis, every new clue is read however suits the moment, and the pattern only shows afterwards.