CPU scheduling decisions may take under the following circumstances:
(1) when a process switches from the running state to the waiting state
(2) when a process switches from the running state to the ready state
(3) when a process switches from the waiting state to the ready state
(4) when a process terminates
(5) when a process switches from the new state to the ready state
(6) when a process switches from the suspended state to the ready state
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