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(a) 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; (b) the testimony is based on sufficient facts or data; (c) the testimony is the product of reliable principles and methods; and (d) the expert has reliably ...
Evid. 702, reflects Massachusetts common law. The proponent of expert testimony must establish the foundational requirements for admissibility, and the judge, as the ?gatekeeper? of the evidence, must make a threshold determination that those requirements have been met before the testimony goes to the jury.
While the amended FRE 702 does not require a court to ?nitpick an expert's opinion to reach a perfect expression? of what might be supportable testimony, it ?does not permit the expert to make claims that are unsupported by the expert's basis and methodology.?
Rule 26(e)(1) requires supplementation of previously complete responses to discovery (either in a deposition or by interrogatories, or otherwise) in only certain limited respects: (a) the identity and location of persons having any knowledge of discoverable matters, provided the identity and location of such persons ...
For this kind of generalized testimony, Rule 702 simply requires that: (1) the expert be qualified; (2) the testimony address a subject matter on which the factfinder can be assisted by an expert; (3) the testimony be reliable; and (4) the testimony ?fit? the facts of the case.
Where an expert witness testifies to an opinion based on a new or novel scientific methodology or principle, the proponent of the opinion has the burden of showing the methodology or scientific principle on which the opinion is based is sufficiently established to have gained general acceptance in the particular field ...
If scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise.
For the latter category of experts, Rule 26(b)(4)(B) of the Massachusetts Rules of Civil Procedure provides that discovery may only be had upon a showing of exceptional circumstances under which it is impracticable for the party seeking discovery to obtain facts or opinions on the same subject by other means.