Since much of the criticism of expert testimony has centered upon the hypothetical question, it seems wise to recognize that opinions are not indispensable and to encourage the use of expert testimony in non-opinion form when counsel believes the trier can itself draw the requisite inference. The rule accordingly recognizes that an expert on the stand may give a dissertation or exposition of scientific or other principles relevant to the case, leaving the trier of fact to apply them to the facts. Most of the literature assumes that experts testify only in the form of opinions. The most common source of this knowledge is the expert witness, although there are other techniques for supplying it. Notes of Advisory Committee on Proposed RulesĪn intelligent evaluation of facts is often difficult or impossible without the application of some scientific, technical, or other specialized knowledge. (d) the expert has reliably applied the principles and methods to the facts of the case.
(c) the testimony is the product of reliable principles and methods and
(b) the testimony is based on sufficient facts or data (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 A witness who is qualified as an expert by knowledge, skill, experience, training, or education may testify in the form of an opinion or otherwise if:
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