Source: http://masslitapp.com/html/Federal_Rules_of_Evidence/062017/Federal_Rules_of_Evidence_062017Rule_611.html
Timestamp: 2019-04-19 22:21:44+00:00

Document:
Item (1) restates in broad terms the power and obligation of the judge as developed under common law principles. It covers such concerns as whether testimony shall be in the form of a free narrative or responses to specific questions, McCormick §5, the order of calling witnesses and presenting evidence, 6 Wigmore §1867, the use of demonstrative evidence, McCormick §179, and the many other questions arising during the course of a trial which can be solved only by the judge's common sense and fairness in view of the particular circumstances.
Item (3) calls for a judgement under the particular circumstances whether interrogation tactics entail harassment or undue embarrassment. Pertinent circumstances include the importance of the testimony, the nature of the inquiry, its relevance to credibility, waste of time, and confusion. McCormick §42. In Alford v. United States, 282 U.S. 687, 694, 51 S.Ct. 218, 75 L.Ed. 624 (1931), the Court pointed out that, while the trial judge should protect the witness from questions which “go beyond the bounds of proper cross-examination merely to harass, annoy or humiliate,” this protection by no means forecloses efforts to discredit the witness. Reference to the transcript of the prosecutor's cross-examination in Berger v. United States, 295 U.S. 78, 55 S.Ct. 629, 79 L.Ed. 1314 (1935), serves to lay at rest any doubts as to the need for judicial control in this area.
“We recommend that the rule allowing questions upon any part of the issue known to the witness * * * be adopted. * * *’ ” McCormick, §27, p. 51. See also 5 Moore's Federal Practice 43.10 (2nd ed. 1964).
The House amendment providing broader discretionary cross-examination permitted inquiry into additional matters only as if on direct examination. As a general rule, we concur with this limitation, however, we would understand that this limitation would not preclude the utilization of leading questions if the conditions of subsection (c) of this rule were met, bearing in mind the judge's discretion in any case to limit the scope of cross-examination [see McCormick on Evidence, §§24–26 (especially 24) (2d ed. 1972)].
Further, the committee has received correspondence from Federal judges commenting on the applicability of this rule to section 1407 of title 28. It is the committee's judgment that this rule as reported by the House is flexible enough to provide sufficiently broad cross-examination in appropriate situations in multidistrict litigation.

References: §5
 §1867
 §179
 §42
 v. 
 v. 
 §27