no plan survives contact
expressionops culturesecurity
Moltke's maxim: the plan is what you have until reality responds, then adaptation is the actual skill.
Field marshal Helmuth von Moltke's original point was not to skip planning but to plan for deviation - which is exactly the argument for incident runbooks that rehearse decision-making rather than script it, and for DR tests that expect surprises.
Also known as: no plan survives first contact