Grand strategy in a human-agent collective should be run from both directions at once: purpose worked backwards into candidate conditions from the top, and tested action and evidence feeding forwards from the bottom, with the two meeting at the choice of the next objective rather than either one dictating it.

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Backcasting feeds candidate future conditions into diagnosis but does not dictate which objective is selected.

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an actor needs an objective and preparation but also the ability to abandon the game plan when circumstances require it.

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Its purpose is to prevent two opposite failures: stubbornly preserving a broken strategy because the purpose is important, and silently changing the purpose because the current route is difficult.