The performance gave a listener no reason to challenge his assessment.

The findings challenge the Government's assessment that no third world country, except perhaps North Korea, could deploy such a threat before 2010.

The study, which will be published later this month, challenges the Pentagon's assessment of future military threats as unrealistic.

"That's parental judgment as to maturity," he said, adding that it might be difficult for a young operator to challenge a parent's assessment.

Under state law, city property owners can use recent sales prices of comparable buildings to challenge their assessment.

But each year, at least 45,000 property owners challenge their assessment before the Tax Commission.

Any senator, however, may challenge the presiding officer's assessment and request a recorded vote.

Challenging your assessment on your own may still require a certain amount of mathematical skill - and knowledge of the tax bureaucracy.

No one even thought to challenge his assessment that the Insectoids were waiting for them.

No one followed me, or challenged her assessment of me as a turncoat who had abandoned her culture.