An expert report is a study written by one or more
authorities that states findings and offers
opinions
An opinion is a judgement
Judgement (or US spelling judgment) is also known as ''adjudication'' which means the evaluation of evidence to make a decision. Judgement is also the ability to make considered decisions.
The term has four disti ...
.
In law, expert reports are generated by
expert witness
An expert witness, particularly in common law
In law, common law (also known as judicial precedent or judge-made law, or case law) is the body of law created by judges and similar quasi-judicial tribunals by virtue of being stated in written ...
es offering their opinions on points of controversy in a
legal case
A legal case is in a general sense a dispute between opposing parties which may be resolved by a court
A court is any person or institution, often as a government institution, with the authority to Adjudication, adjudicate legal disputes betw ...
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
A fact is something that is truth, true. The usual test for a statement of fact is verifiability—that is whether it can be demonstrated to correspond to experience. Standard reference works are often used to check facts. Science, Scientific ...

, 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
Major trauma is any injury
Injury, also known as physical trauma, is damage
Damage is any change in a thing, often a physical object, that degrades it away from its initial state. It can broadly be defined as "changes introduced into a s ...
.
References
{{reflist
Legal literature
Medical literature
lt:Teismo ekspertizė
ru:Судебная экспертиза