Instead, you are honored for achieving your own challenging goals.

Thus, the results of this study show that performance improved immediately upon the assignment of a specific, challenging goal.

And it provides a challenging but attainable goal.

Studies also show that in order to increase online participation, the contributors must feel unique, useful, and be given challenging and specific goals.

"Without challenging goals," she wrote in the calendar, "what else is there besides chocolate?"

This award recognises people who can set their own challenging goals and achieve them.

This can be a challenging goal, but the potential reward is worth some hassle.

He said they had done fairly well, considering the challenging goals they had set.

It is time to make it clear that achieving a global economy is an extremely challenging goal, but an absolutely essential one.

An understanding that, above anything else, success requires genuine effort, a willingness to set challenging goals.