The pursuit is one of the most challenging programs of scientific research and development that has ever been undertaken.

Many singers of her stature would have contented themselves with a far less challenging program on Sunday.

Its academically challenging program is so popular that it received 4,000 applications for 180 spots.

It was the second substantive Boulez score on this challenging program.

The talented young musicians are back this weekend for another challenging program.

It builds on the curriculum by providing students with a challenging program in all academic areas.

The school offers exciting and challenging programs for the students.

Indeed, these hugely challenging programs went out of their way to be incongruous.

The high school has a large range of challenging programs available for students.

The challenging program required a museum, research and archival space of 68,000 square feet.