Draft report protection shields expert draft reports and most attorney-expert communications from discovery.

Expert file production is the disclosure of an expert's working file, subject to draft and communication protections.

An expert report is the written disclosure a retained expert must provide, stating all opinions, their bases, the data considered, qualifications, and...

A materials considered list identifies everything an expert reviewed in forming opinions, which is discoverable.

A rebuttal expert responds to opinions disclosed by an opposing expert rather than offering affirmative opinions.

Reliance materials are the specific facts, data, and documents an expert depended on in forming opinions.

Rule 26(a)(2) disclosure is the required identification and description of testifying experts and their opinions.

A supplemental expert report corrects or completes a prior report, distinguished from an untimely new opinion.