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The test in new Rule 4007.4 is whether the party or the expert witness knows that the response was incorrect or is no longer correct in the light of intervening events of which he has knowledge. If he knows this, he must correct the response. If he does not know it, he need do nothing.
Pa. R.E. 702 states that an expert may testify in the form of an ''opinion or otherwise. '' Much of the literature assumes that experts testify only in the form of an opinion.
Unless the court upon motion, for the convenience of parties and witnesses and in the interests of justice, orders otherwise, methods of discovery may be used in any sequence and the fact that a party is conducting discovery, whether by deposition or otherwise, shall not operate to delay any other party's discovery.
Discovery of Expert Testimony. Trial Preparation Material. (B) subject to the provisions of subdivision (a)(4), the other party to have each expert so identified state the substance of the facts and opinions to which the expert is expected to testify and a summary of the grounds for each opinion.
Rule 702 ? Testimony By Expert Witnesses It states that an expert's opinion is admissible if: the expert's scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence or to determine a fact in issue. the testimony is based on sufficient facts or data.
Code § 401. Evidence is relevant if: (a) it has any tendency to make a fact more or less probable than it would be without the evidence; and (b) The fact is of consequence in determining the action.
The exceptions enumerated above simply describe some of the matters that may be covered in a deposition. However, in the absence of cause shown, the Pennsylvania rules of civil procedure do not permit an expert to be deposed.
Code § 701 - Opinion Testimony by Lay Witnesses. (c) not based on scientific, technical, or other specialized knowledge within the scope of Rule 702.