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Rule 195.4. Oral Deposition (Aug. 1998)


195.4 . In addition to disclosure under Rule 194, a party may obtain discovery concerning the subject matter on which the expert is expected to testify, the expert's mental impressions and opinions, the facts known to the expert (regardless of when the factual information was acquired) that relate to or form the basis of the testifying expert's mental impressions and opinions, and other discoverable matters, including documents not produced in disclosure, only by oral deposition of the expert and by a report prepared by the expert under this rule.

Aug. 4, 1998, eff. Jan. 1, 1999.

Prior Amendments Future Amendments
  Nov. 9, 1998, eff. Jan. 1, 1999

Notes and Comments

Comments to 1999 change:

1. This rule does not limit the permissible methods of discovery concerning consulting experts whose mental impressions or opinions have been reviewed by a testifying expert. See Rule 192.3(e). Information concerning purely consulting experts, of course, is not discoverable.

2. This rule and Rule 194 do not address depositions of testifying experts who are not retained by, employed by, or otherwise subject to the control of the responding party, nor the production of the materials identified in Rule 192.3(e)(5) and (6) relating to such experts. Parties may obtain this discovery, however, through Rules 176 and 205.

3. In scheduling the designations and depositions of expert witnesses, the rule attempts to minimize unfair surprise and undue expense. A party seeking affirmative relief must either produce an expert's report or tender the expert for deposition before an opposing party is required to designate experts. A party who does not wish to incur the expense of a report may simply tender the expert for deposition, but a party who wishes an expert to have the benefit of an opposing party's expert's opinions before being deposed may trigger designation by providing a report.


Nov. 9, 1998, eff. Jan. 1, 1999