Intelligence is the collection and analysis of information by a power, to enable it to make maximum use of its resources against rivals and potential enemies. Intelligence is not a form of power but a means to guide its use, whether as a force multiplier, or by helping statesmen to understand their environment and options, and thus how to apply force or leverage, and against whom. Intelligence is a rational activity, but its significance, like rationality itself, is limited. Intelligence shows what can be understood in the context of what cannot be known. It commonly addresses several related questions, which can be answered only in probabilistic terms, hence the uncertainty of any answer must be multiplied by that of others. Subjects under observation defy their observer through denial and deception, and alter their behaviour in response to that of the observer. They use intelligence to guide their actions — and so affect the behaviour of the observer. The truth is not just out there; through the use of intelligence powers may gain greater knowledge of the international environment — and alter it.
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