Decision cycle refers to the continual use of mental and physical processes by an entity to reach and implement decisions.

• Within the United States military, a theory of an Observe-Orient-Decide-Act Loop has been advocated by Colonel John Boyd.
• In quality control, Plan Do Check Act is used.
• In science, the Scientific method ("hypothesis" - "experiment" - "evaluation" or Plan, Do, and Check) can also be seen as a decision cycle.

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