The difficulty in assessing quality teaching makes differentiated salary scales impractical.
The issue of Earth's limits is an unsettled question, not least because of the sheer diversity of natural resources and the difficulty in assessing them scientifically.
The O.E.C.D. did not provide specific annualized forecasts for the Japanese economy because of the difficulty in assessing the effects of the earthquake and tsunami.
In his letter, Mr. Buffett explained that the danger of derivatives was not merely the difficulty in assessing their value; rather, it was the "web of mutual dependence" they create among financial institutions.
The difficulty in assessing the state of today's military is that the Pentagon's system for measuring readiness ultimately measures only one thing: fighting a major ground war with air and naval support.
Part of the difficulty in assessing or ranking those other lead sources, however, is that almost all of the attention and research have been focused on acute indoor exposure pathways that are most dangerous to small children, like peeling windowsills and baseboards that can leave chips on the floor.
The difficulty in assessing the state of mental health among young people and identifying trends is partly attributable to a lack of "concrete data" and no "reliable time series" according to Bell who claims that what we know today is "very much based on gleaning it from what [old data] we do have".
WASHINGTON — While American spy agencies have believed that the Iranians halted efforts to build a nuclear bomb back in 2003, the difficulty in assessing the government's ambitions was evident two years ago, when what appeared to be alarming new intelligence emerged, according to current and former United States officials.
We understand the difficulty in assessing the context of potentially controversial content.
This arises from the difficulty in assessing behavior-oriented prevention in different settings.
The difficulty in assessing legal liability, however, is determining who benefited wrongly in a specific way.
