The phrase "exercise in efficiency" is correct and usable in written English.
It can be used when discussing a practice or activity aimed at improving efficiency in a particular context.
Example: "The workshop was an exercise in efficiency, demonstrating how to streamline our workflow."
Alternatives: "practice in efficiency" or "test of efficiency".
The processor: leadership as an exercise in efficiency.
Second, they have reengineered their companies to be time-based but done so as an exercise in efficiency, not strategy.
Their exercise in efficiency coincided with a display of wastefulness from an Everton outfit who have not realised their considerable potential.
Here, stairs are deemed an unnecessary waste of time, so in an exercise in efficiency, staff slide down a fireman's pole to get to the floor below.
Having opened my share of thank-you notes over the years and having watched my kids write their own, I knew that nonwriters treat the process as an exercise in efficiency.
At the simplest level, I think the concept behind the Embedded Mobile House can be seen as an exercise in efficiency and at the grandest, an attempt at elegance.
Manchester City prepared for Tuesday's trip to Old Trafford with an exercise in ruthless efficiency as Yaya Touré led a rout of Fulham with his first hat-trick in English football.
In December of that year, Summers wrote a private memo that characterized developing countries as "under-polluted" and suggested that toxic waste should be sent to such areas as an exercise in economic efficiency.
In advance of its formal introduction next month at the Frankfurt auto show, the Up, an exercise in fuel efficiency and miniaturization, was unveiled online by Volkswagen over the weekend.
They're meant to be an exercise in primal efficiency, an expression of frugality, and the result of just a smidgen of poverty.
A central aim was to investigate changes in exercise efficiency and exercise economy in response to conditions of environmental hypobaric hypoxia.
