The phrase "authoritative assessment" is correct and usable in written English.
It can be used when referring to a judgment or evaluation that is considered reliable and credible, often made by an expert or an official source.
Example: "The committee provided an authoritative assessment of the project's feasibility, ensuring all stakeholders were informed of the potential risks."
Alternatives: "definitive evaluation" or "expert appraisal".
The last authoritative assessment of the topic was done by the UN's Intergovernmental Panel on Climate Change (IPCC) in 2001.
Congressional officials had hoped that the report would provide the first authoritative assessment of whether Saudi Arabia played any role, even unwittingly.
Perhaps there is a case for flexibility in such matters, with a more authoritative assessment of the pitch and its capabilities and an appropriate adjustment.
The most authoritative assessment I found was a paper, "Can Terrorists Build Nuclear Weapons?" written in 1986 by five experienced nuke-makers from the Los Alamos weapons laboratory.
The United Nations' Declaration of Commitment provides an authoritative assessment of the global threat posed by H.I.V. and AIDS and outlines a clear direction for addressing and correcting fundamental challenges.
After many months of rival assertions by interested parties, we finally have an authoritative assessment by an impartial referee of the effects of the so-called Gang of Eight senators' proposed legislation on immigration.
Left to his own devices, he is years away from developing nuclear weapons, according to two authoritative assessments issued this month.
Authoritative assessments from the Intergovernmental Panel on Climate Change, among other studies, have left little doubt that the world is heating up, that man-made emissions are largely responsible and that swift action is necessary to avoid widespread environmental damage.
These include the continuing vulnerability and persecution of the Muslim Rohingya minority in the west of the country, who, according to authoritative assessments face the prospect of genocide if little is done to increase their security.
The report, which draws on independent research, official statistics, national insurance figures and labour force surveys, provides one of the most authoritative assessments of eastern European migration patterns in and out of the UK and is likely to be studied closely by politicians as the debate about immigration heats up in the weeks leading up to the general election.
These authoritative assessments answer many questions, but they also raise many others, including "Who cares about more of the same?" and, perhaps more important, "What did our not listening to earlier warnings cost us, my family, my grandchildren, my country and my planet?" The first question is logical.
