Sentence examples for a challenging assertion from inspiring English sources

Speaking before the audience at the recent IAPP Data Protection Congress in Brussels, keynoter Woody Hartzog made a challenging assertion: "Control is the wrong goal for privacy by design, perhaps the wrong goal for data protection in general". But isn't control a central tenet of good privacy?

Stimulated by the challenging assertion from the FDA and some industry spokesmen that horizontal gene transfer from transgenic plants to microorganisms does not occur, a number of investigators have embarked on studies to show that this statement is false.

And a challenging business.

after a challenging summer.

It is a challenging task.

It was a challenging situation.

It is a challenging job.

It needs a challenging headliner.

Goldman had a challenging 2010.

Was it a challenging experience?

A challenging environment.