“good cause” as the governing principle, although in the former, the party desiring to withhold must make the showing, while in the latter, the “burden” falls upon the party seeking discovery. This “burden”, however, is not a burden of persuasion but simply governs the order in which each party must present his case.7 This is evident from the nature of “good cause” itself, for although the rules establish it as a standard, it has no frame of reference. The Court’s decision, therefore, ultimately is no more than a comparative evaluation of competing claims of need and prejudice. But to inject notions of burden of persuasion into an analysis of such a subjective nature is to create a disparity in legal standards between 26 and 34, a result contrary to the language and philosophy of the discovery rules.
Basically, plaintiff relies upon the following to support its showing of need:
(a) The documents are relevant for they contain opinions and conclusions of experts, arrived at after careful and first-hand investigation, as to the causes of the collision which gave rise to this suit.
(b) They may contain useful admissions.
(c) The documents may be useful for purposes of cross-examination or impeachment of witnesses or of clarifying the testimony of other witnesses.
(d) Although the documents are said to contain only opinions and conclusions, disclosure may lead to unknown facts which will become evident once the conclusion is divulged. As stated in the earlier opinion of the Court, the circumstances of this case make discovery of such factual matter of the utmost importance, and questions as to the facts upon which experts base their opinions are mere stabs in the dark when put forth without knowledge of ultimate conclusions.
(e) There is no other way to obtain the desired information.
Defendant, on the other hand, again relies on the policy of the USAF to restrict use of these reports solely to flight safety purposes in order to encourage accident investigators to testify fully and to assess blame freely. It also points out that the government attorneys do not have access to these documents in preparing their case and that a representative of UAL was present at the AAIB proceedings and heard at least one of these reports read aloud. Finally, defendant contends that, in the absence of special circumstances, expert opinions need not be divulged in discovery proceedings.
Discovery is not automatically precluded because the sought-after material contains expert opinions or conclusions. Zenith Radio Corp. v. Radio Corporation of America, D.C.D.Del.1954, 121 F.Supp. 792. Nevertheless,' some courts have been reluctant to allow inquiry which goes beyond matters of objective fact. See e. g.,
Walsh v. Reynolds Metals Co., D.C.D.N.J.1954, 15 F.R.D. 376. Many reasons have been given to justify this reluctance. Chief among these is the argument that if one party hires and pays an expert, it would be unfair to allow his adversary to pry into, and take advantage of, the expert’s work. More basic, perhaps, is the notion that the discovery rules are intended to aid preparation for trial by narrowing and clarifying issues and providing flexible means to ascertain basic facts. Hickman v. Taylor, 1947, 329 U.S. 495, 67 S. Ct. 385, 91 L.Ed. 451. Discovery of opinions or conclusions, however, furthers these goals in only a tangential manner, for while a witness to a physical occurrence is relatively unique, and,
7
For a discussion of the distinction between a burden of persuasion and a burden of going forward with evidence, see McCormick on Evidence, §§ 306-7 (1954).