The phrase "action at a time" is correct and usable in written English.
It can be used to refer to performing one action or task at a specific moment rather than multitasking.
Example: "To improve productivity, it's essential to focus on one action at a time."
Alternatives: "one task at a time" or "single action at a time".
It is a slow sport, one player in action at a time.
Disabled people saw a need for early action at a time when the big disability charities remained silent.
Taking decisive and effective action at a time when accusations about the army's loyalty abound could prove to be a dangerous move.
But you took an action at a time when you felt yourself to be cool and calm and reasonable, and made a decision at that moment that you took to be binding upon yourself in the future.
Any effort to ameliorate the damaging consequences to the employment marketplace stemming from technological innovation, according to Brynjolfsson, requires substantial government action at a time when "the political system is the most dysfunctional part of our society".
And their two gigawatts of atomic power is out of action at a time when capacity has been reduced at two coal-fired facilities, Ironbridge and Ferrybridge, because of fires.
Trump's critics also accuse him of hypocrisy for employing executive orders and other actions at a time when his agenda is stalled in Congress.
"We will continue to take a variety of actions at a time and place of our choosing, some of which will not be publicized," he said in a statement released by the White House.
At this stage neither Turing nor any other logician made a serious investigation into the physics of such 'doing.' But Turing's image of a teleprinter-like machine does inescapably refer to something that could actually be physically 'done.' His concept is a distillation of the idea that one can only 'do' one simple action, or finite number of simple actions, at a time.
We will continue to take a variety of actions at a time and place of our choosing, some of which will not be publicized," Obama said in his statement, adding that his administration will report to Congress about Russia's interference during this election season, as well as other hacking attempts on previous elections.
Today's vapid hairdos who pretend to be "news anchors" should look closely at Cronkite's actions at a time when he believed the nation was in peril.
