The phrase "a challenging set of" is correct and usable in written English.
It can be used when describing a group of tasks, problems, or items that are difficult or require significant effort to address or complete.
Example: "The students were given a challenging set of math problems to solve for their homework."
Alternatives: "a difficult collection of" or "a tough series of".
Evolution presents a challenging set of concepts and principles for students to master, with these challenges amplified due to societal resistance (Nelson 2012).
All of this came together in the context of explaining what kind of scientist would embark on such a challenging set of projects.
Think 18 miles an hour on a 35 degree angle - for many skiers, including myself, a challenging set of statistics just going downhill.
Most of all, you see what a challenging set of tasks they have been given, and how short-staffed they are.
At a news conference Thursday alongside the auto workers' president, Rick Wagoner, G.M.'s chairman, said the settlement would "enable us to work together effectively to address what I think is pretty clearly a challenging set of competitors".
Rick Wagoner, the chairman and chief executive of G.M., said the agreement "will enable us to work together effectively to address what is pretty clearly a challenging set of competitors".
The PASCAL 2011 dataset A, for instance, is considered to be a very challenging set of noisy signals.
However, the physical means associated with enhancing computing capabilities at the device and die levels have also created a very challenging set of circumstances for keeping electronic devices cool, a critical factor in determining their speed, efficiency, and reliability.
Put all those together and you have a very challenging set of circumstances to address often in seconds".
It's thoughtful and slow-paced and its quaint looks hide a really challenging set of puzzles.
His constant enthusiasm, though, belied a very challenging set of fundamentals about the likelihood of the product's success. .
