"challenge project" is correct and usable in written English.
You can use it in any context where you are referring to a project that has a lot of challenges or difficulty associated with it. For example: "I'm excited to take part in my new challenge project at work, which involves developing a new system to streamline our workflow."
The records also show that he and Mr. Obama worked on the Challenge project together and that they attended some of the same meetings.
Supporters of Mr. McCain have been trying to taint Mr. Obama by highlighting his ties to William Ayers, a member of the violent Weather Underground in the 1960s, by pointing out that they worked on the Challenge project together.
As the American-led forces approached Baghdad last spring, the M-14 put into place "The Challenge Project," in which Mr. Hussein's intelligence officers scattered to lead a guerrilla insurgency and plan bombings and other attacks, the report states.
A separate London Challenge project, which began under Labour in 2003 to improve the worst schools, has paid off handsomely, getting good teachers and experts to help tackle poor schools and track their progress more effectively.Yet the capital still has too few soaring successes.
the London Challenge project to support schools.
However, "Financial constraints" challenge project funding.
These models were all from Useful Chemistry and Open Notebook Science Challenge projects [43].
We provide an overview of our foundry activities that are being applied to grand challenge projects to deliver innovation in bio-based chemicals production for industrial biotechnology.
And neighbors should have the right to challenge projects.
The remaining money will go toward future X Challenge projects.
Observers say planners are increasingly being empowered to challenge projects that don't fit the community vision.
