It is correct and usable in written English.
You can use it when you want to describe someone or something that is able to do something quickly and effectively, or with a minimum of waste or effort. Example: I was very impressed with her work; she was efficient in doing her assignments.
Of the three choreographers Mr. Elo is the most efficient in doing what he wants to do.
We're trying to do an end run around the maxim that you get what you pay for and we think we're being efficient in doing it.
In his 1949 book, The Organization of Behavior, Canadian psychologist Donald Hebb theorized that cells in the brain that regularly interact become more efficient in doing so.
But all in all, it looks like the goats did the job they were brought in for, and were very efficient in doing so.
Those watercourses have in fact been very dangerous to the village over the centuries, and survival meant keeping them in check, even at the expense of your neighbors; and Azzano is singled out by the authors of Trevi de planu as having been one of the most efficient in doing just that in the early 18c.
And they have also become much more efficient in doing it.
We spend to the max, but we try to be as efficient as you can in doing it and pick the right players".
But we are more efficient now in doing the same business from our center in Aguascalientes, [Mexico], than we are from our center in Wuxi".
However, it was reported that the checkpoint meetings could be more efficient if done in a more direct manner, and that efficiency should be weighed against the need to protect the anonymity of the reviewers.
"What's going on at a broader level is a sense of, 'Hey, we can be much more effective and efficient than government in doing things,' " said Leslie Lenkowsky, a professor of philanthropic studies and public affairs at Indiana.
The longstanding conservative claim is that the open market is far more efficient than government in doing things, especially when it comes to anything involving medical care.
