opinion: Consuelo MERCADO, Plaintiff-Appellant, v. AUSTIN POLICE DEPARTMENT, Defendant-Appellee.
  No. 84-1471.
  United States Court of Appeals, Fifth Circuit.
  March 14, 1985.
  James M. Simons, Austin, Tex., for plaintiff-appellant.
  Robert Icenhauer-Ramirez, Asst. City Atty., Austin, Tex., for defendant-appellee.
  Before RUBIN and HILL, Circuit Judges, and HINOJOSA , District Judge.
  District Judge of the Southern District of Texas sitting by designation.
  ALVIN B. RUBIN, Circuit Judge:
  The plaintiff filed this Title VII suit, contending that she was discharged by the City of Austin because of her national origin and in retaliation for filing an EEOC complaint seven years earlier. After hearing her testimony, the judge asked her counsel what additional evidence he would offer in support of her case. Counsel’s response to the judge’s question did not indicate that he would offer anything but cumulative or irrelevant testimony. He made no proffer of evidence, either then or in his subsequent motion for a new trial. At the conclusion of the plaintiff’s testimony, the district judge invited the defendant to move for involuntary dismissal of the case pursuant to Fed.R.Civ.P. 41(b) and then granted the motion. While the procedure was unconventional, we conclude that the plaintiff was not denied due process of law and has shown no prejudice as a result of the procedure followed. Accordingly, we affirm.
  I.
  Consuelo Mercado testified in support of her claims and was cross-examined at length. Appraising her credibility, which the district court was best qualified to assess, the district court found that she simply did not establish the requisite elements of her charge of discrimination or retaliation. She made vague assertions that she was treated differently from other supervisors, testified that she was not asked for her opinion very often or invited to birthday parties, and referred to trifling deemed slights. On cross-examination, counsel for defendant prodded her into admitting that: (1) she really did not personally know how the City had treated a number of the other supervisors; (2) her supervisors allowed her to discuss her complaints directly with high ranking officials more often than they allowed other supervisors to do; (3) there were numerous problems with her performance, which were well documented in written evaluations, such as poor communication with her subordinates, failure to take constructive criticism appropriately or at all, accosting one of her subordinates in the parking lot, threatening her subordinates with the placing of damaging memos in their files if they talked to each other, and filing a negative report on one of her subordinates because the subordinate had done more than her share of the work and had helped a new employee with his work.
  Defense counsel impeached Mercado’s credibility in many ways. She admitted that a key Police Department supervisory official whom she charged with prejudice against Mexican-Americans was in fact married to a Mexican-American. She also admitted that she chose to be discharged rather than to accept assistance from the City’s personnel department in locating a nonsupervisory job with the City of comparable pay grade and job classification. In sum, the evidence garnered on cross examination from Mercado herself was so damaging that, after she left the stand, virtually no later witness could have helped her to establish a prima facie case.
  After hearing Mercado, the district judge addressed her counsel and asked whether he had any further witnesses. Counsel said he planned to call two expert witnesses and three employees of the Austin Police Department. The judge then informed Ms. Mercado’s counsel that the reason for making his inquiry was “that based upon the testimony this court has heard so far, the court is inclined at the present time to dismiss this case outright. I can find absolutely no basis on testimony of the plaintiff for the complaints contained in the complaint.” The court added,
  If you had any witnesses that might establish a prima facie case of some kind, which you have not done in the court’s view on the basis of the plaintiff’s testimony, the court would be willing to spend more time on this. I’m not going to continue to waste time not only of this court, which has many other cases to handle, but the staff of this court, to take evidence in a case unless you have got more than I have heard in the last half day.
  Counsel’s only reply was:
  I can’t represent to the court that the police department witnesses that we would call — and they would be the three that I have enumerated earlier — would add anything different than what the plaintiff has testified to. I just think they would add corroborative—
  Except for a vague statement that one of the experts might produce evidence about a pattern of discrimination, counsel made no proffer of any kind. Even surprise at these events on April 9, 1984, does not explain why no proffer was later made when, on April 19, counsel for Mercado sought a new trial.
  The pretrial order states that a list of witnesses would be filed but none was filed with the court although counsel states he gave a list to opposing counsel. There was, therefore, no way in which the district court might have known that there was other evidence favorable to Mercado. Even now, in brief and at oral argument counsel has not stated any specific way in which the testimony of the witnesses mentioned to the court would have established the requisite elements of Mercado’s case. The brief engages only in speculation: “The other witnesses the Plaintiff proposed to call might well have supplied any missing links in her prima facie case.”
  This is not a case in which counsel lacked time to prepare. It had been pending on the court’s docket for nearly two years. Mercado had twice sought and received extensions of time to complete discovery. In January, 1984, she asserted to the trial court that discovery had been completed. She then sought an order compelling the defendant to answer interrogatories on March 16. On March 23, that motion was denied but the defendant was ordered to give her access to the records containing the information sought by her interrogatories. That same day, the judge granted Mercado’s motion for a continuance so that she could gather that information. Then on the Sunday afternoon prior to the Monday-morning trial, she served a subpoena duces tecum, requesting the same statistical data to which the trial judge had given her access in March. At trial, the district judge refused to enforce this subpoena which was clearly designed to subvert and defeat the objective of his March 23 order.
  II.
  Fed.R.Evid. 103(a) forbids an appellate court to predicate error on a ruling excluding evidence “unless a substantial right of the parties is affected, and ... in case the ruling is one excluding evidence, the substance of the evidence was made known to the court by offer, or was apparent from the context within which questions were asked.” Moreover, we have repeatedly held that, when a trial judge excludes the testimony of a witness in whole or in part, we cannot determine that there was error in the exclusion if the appellant made no offer of proof in the court below. Because Mercado’s counsel had taken depositions of at least some of the witnesses who might have been called, had been granted access to the Police Department’s records (although he had not taken advantage of this access), and over a two-year period had received extensions for further discovery, we find no excuse for his failure either to make an oral offer of proof sufficiently specific to satisfy the judge or to direct the judge’s attention to some testimony in one of the depositions to indicate the type of specific testimony that would have been forthcoming.
  In the absence of any list of witnesses with an indication of the nature of their testimony, any proffer of evidence, and any statement of counsel concerning what the evidence might be, it would have been a sheer waste of time for the court to indulge counsel in the suggested ritual by allowing him to adduce duplicative and unhelpful testimony or to fish for material to support his case. Thus, the judge’s exclusion of the lay witnesses from the police department, pursuant to Fed.R.Evid. 403, was not an abuse of discretion, for counsel’s own statement implied, if it did not state directly, that these witnesses would add nothing new to Mercado’s testimony.
  Mercado’s expert witness, as stated in her counsel’s resume, would have expressed the opinion that discrimination “was an element of” the personnel action taken. Although counsel stated that the expert’s opinion was based upon Mercado’s testimony and upon additional materials, the district court judge had previously noted that an expert was not the kind of witness that could aid Mercado in forging the missing links in her case. The explanation of the testimony that would be elicited from the expert disclosed nothing that, if adduced, was likely to convince the judge,
  Fed.R.Evid. 702 states:
  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 ... may testify thereto in the form of an opinion or otherwise,
  Whether an expert will assist the trier of fact to understand the testimony is a preliminary question for the trial court and its determination is “largely committed to that court.”
  That court has what we have described as “wide discretion” in deciding the matter, particularly when the court sits as trier of fact, for the district judge is th^n in the best position to know whether expert testimony would help him understand the case.
  Rule 41(b) allows the defendant to move for a dismissal after the plaintiff has completed the presentation of his evidence. When such a motion is made, the judge “must weigh and evaluate the evidence as if he were making findings of fact at the conclusion of the case,” and he may not reject the “uncontradicted and unimpeached testimony of the only witness presented at the trial until that time ..., unless [the] testimony was inherently incredible, ... suspicious or inherently improbable____” The judge’s dismissal of Mercado’s case did not transgress these rules, for Mercado’s testimony was neither unimpeached nor, given her own testimony on cross examination, uncontradicted.
  “It is not absolutely necessary that dismissal be delayed until the close of plaintiff’s case.” Stating that, while “the interests of justice will [ordinarily] be better served if involuntary dismissals for failure to show right to relief are not ordered until the close of plaintiff’s case,” the Third Circuit has approved an involuntary dismissal prior to the close of the plaintiff’s ease because the plaintiff’s remaining evidence was insufficient to establish the cause of action that the plaintiff alleged. The First Circuit has likewise affirmed SU(dl a dismissal as being “well within the purview of the district court’s power to manage its own affairs and to serve the interests of judicial economy.” Like the First Circuit’ we believe that “Mhe facts hfrem reveal °ne of the rare and exception-a cases in which a court is justified in dismissing the action before the completion Piainfiff s case.
  The judge’s findings of fact are amply supported by the record. It was not an abuse of the district judge’s discretion and, under the circumstances, it was a proper exercise of his duty to conduct the trial process economically and efficiently to administer the coup de grace to what he found to be a hopeless case.
  For these reasons, the judgment is AFFIRMED.
  . 42 U.S.C. § 2000e, et seq.
  . See Espino v. City of Kingsville, 676 F.2d 1075, 1078-79 (5th Cir.1982); Liner v. J.B. Talley & Co., 618 F.2d 327, 331 (5th Cir.1980); Meredith v. Hardy, 554 F.2d 764, 765 (5th Cir.1977).
  . See generally 21 C. Wright & K. Graham, Federal Practice and Procedure § 5040, at 210-13 (1977).
  . See Gulf States Util. Co. v. Ecodyne Corp., 635 F.2d 517, 519 (5th Cir.1981); see also Golden Bear Distrib. Sys. of Texas, Inc. v. Chase Revel, Inc., 708 F.2d 944, 951 (5th Cir.1983).
  . See Fed.R.Evid. 104(a).
  . 11 J. Moore & H. Bendix, Moore’s Federal Practice § 702.10[3], at VII-29 (1982) (footnote omitted).
  . Stancill v. McKenzie Tank Lines, Inc., 497 F.2d 529, 535, 536 (5th Cir.1974); see also 11 J. Moore & H. Bendix, supra note 6, at VII-30 (footnotes omitted).
  . See, e.g., Ward v. Westland Plastics, Inc., 651 F.2d 1266, 1271 (9th Cir.1980).
  . Benton v. Blair, 228 F.2d 55, 58 (5th Cir.1955).
  . Id. at 58-59.
  . Crawford v. Western Elec. Co., 614 F.2d 1300, 1311 (5th Cir.1980).
  . 5 J. Moore, J. Lucas & J. Wicker, Moore’s Federal Practice 1f 41.13[1], at 41-163 n. 5 (1984).
  . Lentino v. Fringe Employee Plans, Inc., 611 F.2d 474, 482 n. 15 (3d Cir.1979).
  . Id. at 482.
  . D.P. Apparel Corp. v. Roadway Express, Inc., 736 F.2d 1, 4 (1st Cir.1984).
  . Id. at 4.
  . See Robinson v. M/V Merc Trader, 477 F.2d 1331, 1332 (5th Cir.1973) (factual findings in Rule 41(b) dismissal for failure to show right to relief reviewed under clearly erroneous standard); 9 C. Wright & A. Miller, Federal Practice and Procedure § 2376, at 248 (1971) (same).
instruction: What follows is an opinion from a United States Court of Appeals.
  Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
  In some cases there is some confusion over who should be listed as the appellant and who as the respondent. This confusion is primarily the result of the presence of multiple docket numbers consolidated into a single appeal that is disposed of by a single opinion. Most frequently, this occurs when there are cross appeals and/or when one litigant sued (or was sued by) multiple litigants that were originally filed in district court as separate actions. The coding rule followed in such cases should be to go strictly by the designation provided in the title of the case. The first person listed in the title as the appellant should be coded as the appellant even if they subsequently appeared in a second docket number as the respondent and regardless of who was characterized as the appellant in the opinion.
  To clarify the coding conventions, consider the following hypothetical case in which the US Justice Department sues a labor union to strike down a racially discriminatory seniority system and the corporation (siding with the position of its union) simultaneously sues the government to get an injunction to block enforcement of the relevant civil rights law. From a district court decision that consolidated the two suits and declared the seniority system illegal but refused to impose financial penalties on the union, the corporation appeals and the government and union file cross appeals from the decision in the suit brought by the government. Assume the case was listed in the Federal Reporter as follows:
  United States of America,
  Plaintiff, Appellant
  v
  International Brotherhood of Widget Workers,AFL-CIO
  Defendant, Appellee.
  International Brotherhood of Widget Workers,AFL-CIO
  Defendants, Cross-appellants
  v
  United States of America.
  Widgets, Inc. & Susan Kuersten Sheehan, President & Chairman
  of the Board
  Plaintiff, Appellants,
  v
  United States of America,
  Defendant, Appellee.
  This case should be coded as follows:Appellant = United States, Respondents = International Brotherhood of Widget Workers Widgets, Inc., Total number of appellants = 1, Number of appellants that fall into the category "the federal government, its agencies, and officials" = 1, Total number of respondents = 3, Number of respondents that fall into the category "private business and its executives" = 2, Number of respondents that fall into the category "groups and associations" = 1.
  Your task is to identify the state of the first listed state or local government agency that is an appellant.
choices: not Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachussets Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New New New New North North Ohio Oklahoma Oregon Pennsylvania Rhode South South Tennessee Texas Utah Vermont Virginia Washington West Wisconsin Wyoming Virgin Puerto District Guam not Panama