We're just two normal guys, we're marketers and [business] operators who look at this as the challenge of a lifetime".
The challenge of monitoring "separate but equal" would have been at least as formidable as the challenge of desegregation.
And both face serious demographic problems, given shrinking and aging populations, as well as the challenge of Asia's rising superpowers.
At a certain point, you will face the challenge of letting go as much as the challenge of adding on.
"This challenge is at least as big as the challenge of putting a man on the Moon….
As the challenge of global climate change intensifies, environmentalists have called for redoubled efforts to preserve forests and ecosystems that are critical in balancing greenhouse gas emissions.
In terms of events, we hosted environmental and sustainability recruitment forums at Kings Place, covering subjects such as the challenge of recruiting and retaining sustainability professionals.
The fourth difficulty was the most substantial, but it should probably be understood as the challenge of the meal, rather than a mere drawback.
Even supporters of Nice's advice acknowledged what Stephen Dalton, chief executive of the Mental Health Network, described as "the challenge of implementation".
I view this as the challenge of our time, maybe the most important policy issue facing us, and it's a difficult one.
Yet, when asked what she regards as the challenge of the role, her reply is unexpected: "That it's in my own language".
