An expert report is a study written by one or more authorities
that states findings and offers opinions
In law, expert reports are generated by expert witness
es offering their opinions on points of controversy in a legal case
and are typically sponsored by one side or the other in a litigation in order to support that party's claims. The reports state facts
, discuss details, explain reasoning, and justify the experts' conclusions and opinions.
In medicine, an expert report is a critical assessment of a medical topic, for example, an independent assessment of the cost–benefit ratio
of a particular medical treatment