The phrase "a critical effort" is correct and usable in written English.
It can be used to describe an important or essential attempt to achieve something significant.
Example: "The team made a critical effort to address the environmental issues affecting the community."
Alternatives: "an essential endeavor" or "a vital attempt".
Most of all, the platform is a critical effort by Zynga to extend the torrid growth since its founding in 2007.
If NASA concludes that safety standards are not up to par on Mir and forbids U.S. astronauts from working on the station, it would end what Administration officials say is a critical effort to conduct a host of experiments--from biological and materials science to engineering studies--in preparation for the international station.
The June UN-brokered peace talks are a long shot, but a critical effort to quell the violence.
The critical situation prompted the United Nations to launch a consolidated appeal for $92 million in humanitarian aid in late March, a critical effort to avoid a repeat of the acute food crisis that hit Niger last year.
The IRC is working on an ambitious but absolutely critical effort to provide care for refugees from the moment they step on the shores of Lesvos, Greece until they're registered and on their way to starting a new life.
The G7 has endorsed the Global Health Security Agenda, a critical global effort to strengthen public health systems around the world.
Durbin writes, "I commend our negotiators for this critical effort.
Despite considerable effort in writing operas and songs, Cui had become better known as a critic than as a composer, and even his critical efforts competed for time with his career as an army engineer and expert in the science of fortification.
Rather than press pause as the confirmation process proceeds, the entire nation has a stake in ensuring these critical efforts continue to upgrade our wireless web and the opportunities, innovations and competitiveness it brings to us all.
User acceptance and usability play a critical role: additional effort has to be balanced with enough benefit for the users and interaction design and evaluation should be handled as an intertwined, continuous process.
The civil war between Stephen and Matilda rapidly descended into an attritional campaign, in which castles like Wallingford played a critical role in efforts by both sides to secure the Thames Valley.
