Readiness (operational readiness) is the capability of a unit/formation, ship, weapon system, or equipment to perform the missions or functions for which it is organized or designed [@jointchiefs2016dictionary].
Readiness is not a single number. It is a bundle of capacities and constraints shaped by personnel, training, maintenance, sustainment, and time. Readiness reporting also functions as governance: it influences budgets, deployments, and perceptions of risk.