KENNEDY, Circuit Judge:
We consider this case en banc to address an issue important to the administration of justice in the federal courts. The question is the constitutionality of the section of the Federal Magistrate Act of 1979 which allows magistrates to conduct civil trials with the consent of all parties. 28 U.S.C. § 636(c) (Supp. V 1981).
Pacemaker, Inc., brought this suit alleging patent infringement against Instromedix, Inc. Instromedix counterclaimed for a declaration of the patent's invalidity. The parties, pursuant to 28 U.S.C. § 636(c) and local rules of the District of Oregon, elected to try the case before a United States Magistrate. The magistrate held the patent valid, but not infringed. Both parties appealed, and a panel of this court, sua sponte, raised the question of the constitutionality of trial by a magistrate, an officer not accorded the protections of Article III, section 1, of the Constitution. The panel held the statute invalid and vacated the judgment, Pacemaker Diagnostic Clinic v. Instromedix, Inc., 712 F.2d 1305 (9th Cir. 1983), and the court has convened en banc to reconsider the case. Pacemaker Diagnostic Clinic v. Instromedix, Inc., 718 F.2d 971 (9th Cir. 1983) (order granting rehearing en banc). We hold that, in light of the statutory precondition of voluntary litigant consent and the provisions for the appointment and control of the magistrates by Article III courts, the conduct of civil trials by magistrates is constitutional.
Commencing with the Federal Magistrates Act of 1968, Pub.L. No. 90-578, 82 Stat. 1107, Congress enacted a series of statutes to "reform the first echelon of the Federal judiciary into an effective component of a modern scheme of justice." H.R. Rep. No. 1629, 90th Cong., 2d Sess. 11, reprinted in 1968 U.S.Code Cong. Ad.News 4252, 4253-54. The 1968 Act replaced the former office of United States Commissioner with the new office of United States Magistrate. The 1968 Act was designed to improve the quality of these officers and to enlarge their responsibilities. The Act established minimum qualifications for the office, and vested the appointment authority with the judges of each district. 28 U.S.C. § 631 (1976). Magistrates' jurisdiction was expanded to include duties such as "service as special masters, supervision of pretrial or discovery proceedings, and preliminary consideration of petitions for postconviction relief." H.R.Rep. No. 1629, 90th Cong., 2d Sess. 11, reprinted in 1968 U.S. Code Cong. Ad.News at 4254. See 28 U.S.C. § 636(a), (b) (1976). Magistrates were also given jurisdiction over minor criminal offenses when the accused waives trial by judge before an Article III court. 18 U.S.C. § 3401 (1976).
The Act was amended in 1976, Pub.L.No. 94-577, 90 Stat. 2729, in response to a number of court decisions which had, as a matter of statutory interpretation, limited the jurisdiction of magistrates. E.g., Wingo v. Wedding, 418 U.S. 461, 94 S.Ct. 2842, 41 L.Ed.2d 879 (1974); see S.Rep. No. 625, 94th Cong., 2d Sess. 3-4 (1976); H.R.Rep. No. 1609, 94th Cong., 2d Sess. 5-6, reprinted in 1976 U.S.Code Cong. Ad.News 6162, 6164-66. By clarifying the statutory language, Congress solidified the jurisdiction of magistrates over certain matters. See McCabe, The Federal Magistrate Act of 1979, 16 Harv.J.Legis. 343, 353-54 (1979).
The section at issue here, 28 U.S.C. § 636(c), was enacted in 1979 together with other provisions. The Federal Magistrate Act of 1979, Pub.L. No. 96-82, 93 Stat. 643, § 2(2). Congress' object was "to amend the current jurisdictional provisions for U.S. magistrates . . . in order to further clarify and expand the jurisdiction of U.S. magistrates and improve access to the Federal courts for the less-advantaged." S.Rep. No. 74, 96th Cong., 1st Sess. 1. reprinted in 1979 U.S.Code Cong. Ad.News 1469, 1469. Thus, section 636(c) authorizes magistrates, when specially designated by the district court, to exercise jurisdiction over civil matters and enter a final judgment in the district court in civil cases, provided the parties consent to the reference.
The challenge to the statute is based on the implicit command of Article III that the judicial power of the United States is confined to judges holding commissions under and cloaked with the protections of that article, and the corollary principle of separation of powers. Article III is one of the provisions of the Constitution which delineates the separation of powers among the branches of government. The attributes of Article III judges, permanency in office and the right to an undiminished compensation, are as essential to the independence of the judiciary now as they were when the Constitution was framed. See The Federalist Nos. 78 79 (A. Hamilton); Northern Pipeline Construction Co. v. Marathon Pipe Line Co., 458 U.S. 50, 58-60, 102 S.Ct. 2858, 2865-66, 73 L.Ed.2d 598 (1982); United States v. Will, 449 U.S. 200, 217-221, 101 S.Ct. 471, 481-84, 66 L.Ed.2d 392 (1980). In addition to the unimpeached precedent supporting this proposition, our own experience attests to the substance and reality of the guarantees. A separate and independent judiciary, and the guarantees that assure it, are present constitutional necessities, not relics of antique ideas.
We have observed that separation of powers protections, in some cases, have two components. One axis reaches to the person affected by government action and encompasses his or her relation to a constitutional branch; the other axis runs from each governmental branch to the others to insure separation and independence in the constitutional structure. Chadha v. INS, 634 F.2d 408, 422, 431 (9th Cir. 1980), aff'd, ___ U.S. ___, 103 S.Ct. 2764, 77 L.Ed.2d 317 (1983). These two aspects of the separation of powers rule are applicable here. Where a case is transferred or assigned from an Article III court to a different forum, both the rights of the parties and the relations between the separate branches of the government are implicated. First, we consider whether transfer of the case to a magistrate invades rights personal to the litigants. Second, we examine whether, even if the parties have consented to the procedure, the existence or operation of the alternate forum compromises the essential independence of the judiciary.
At the outset, and leaving aside all consideration of criminal cases, we recognize the principle that parties to a case or controversy in a federal forum are entitled to have the cause determined by Article III judges, with some significant exceptions yet to be fully delineated by the Supreme Court. Northern Pipeline Construction Co. v. Marathon Pipe Line Co., 458 U.S. 50, 102 S.Ct. 2858, 73 L.Ed.2d 598 (1982) (plurality opinion); id. at 89, 102 S.Ct. at 2881 (Rehnquist, J., concurring). We decide the case before us on the further premise that the patent suit here falls within none of the recognized or potential exceptions, even the public rights exception. Id. at 67-76, 102 S.Ct. at 2869-2874. Though no authority we have found expressly so holds, it is appropriate to address the constitutional issue in this patent case. The statutory provision for reference to magistrates applies, without qualification, to all civil cases, and the issue will arise in other matters that do not arguably qualify as a case involving federally created rights. In its recent decision upholding the statute, the Third Circuit adopted the same approach to reach the constitutional issue. See Wharton-Thomas v. United States. 721 F.2d 922, 930 (3d Cir. 1983).
The independent character of federal adjudication under Article III imparts to a judgment qualities of authority and respect that are well understood. It follows that the federal litigant has a personal right, subject to exceptions in certain classes of cases, to demand Article III adjudication of a civil suit. Authorities support the premise that Article III adjudication is, in part, a personal right of the litigant. Glidden Co. v. Zdanok, 370 U.S. 530, 536, 82 S.Ct. 1459, 1465, 8 L.Ed.2d 671 (1962) ("The alleged defect of authority here relates to basic constitutional protections designed in part for the benefit of litigants"); Palmore v. United States, 411 U.S. 389, 412, 93 S.Ct. 1670, 1684, 36 L.Ed.2d 342 (1973) (Douglas, J., dissenting) ("The safeguards accorded Art. III judges were designed to protect litigants with unpopular or minority causes or litigants who belong to despised or suspect classes"); Kurland, The Constitution and the Tenure of Federal Judges: Some Notes from History, 36 U.Chi.L.Rev. 665, 698 (1969) (life tenure of federal judges "not created for the benefit of the judges but for the benefit of the judged"); Kaufman, Chilling Judicial Independence, 88 Yale L.J. 681, 690 (1979) (same). And it could not be otherwise, for in deciding cases or controversies, the judicial branch acts primarily on the litigants before the court. O'Donoghue v. United States, 289 U.S. 516, 532, 53 S.Ct. 740, 743, 77 L.Ed. 1356 (1933) (quoting Chief Justice Marshall in the debates on the Virginia State Convention of 1829-1830).
Magistrates are not protected by Article III status. Their term of office is for four or eight years; they can be removed by the judges of the district or, in some cases, the circuit council; and their salary may be diminished by act of Congress. 28 U.S.C. § 631(e), (i), 633(c) 634 (1976 Supp. V 1981). A mandatory provision for trial of an unrestricted class of civil cases by a magistrate and not by Article III judges would violate the constitutional rights of the litigants. Nevertheless, as this aspect of the separation of powers doctrine embodied in Article III is personal to the parties, it may be waived.
In recent cases, the Supreme Court has not had to consider the constitutional implications of consent by the parties to go before a non-Article III judge, because in none did all parties consent to such a procedure. See, e.g., Northern Pipeline Construction Co. v. Marathon Pipe Line Co., 458 U.S. 50, 102 S.Ct. 2858, 73 L.Ed.2d 598 (1982); United States v. Raddatz. 447 U.S. 667, 100 S.Ct. 2406, 65 L.Ed.2d 424 (1980); Palmore v. United States, 411 U.S. 389, 93 S.Ct. 1670, 36 L.Ed.2d 342 (1973); Glidden Co. v. Zdanok, 370 U.S. 530, 82 S.Ct. 1459, 8 L.Ed.2d 671 (1962). Significantly, in the Court's latest interpretation of Article III, all the Justices, although not forced to confront the issue squarely, indicated that consent is important to the constitutional analysis. See Northern Pipeline, 458 U.S. at 79, n. 31, 102 S.Ct. at 2876, n. 31 (Brennan, J.) (plurality opinion) ("[b]efore the [Bankruptcy Reform] Act the referee had no jurisdiction, except with consent, over controversies beyond those involving property in the actual or constructive possession of the court" (emphasis added)); id. at 91, 102 S.Ct. at 2882 (Rehnquist, J., concurring) ("I would, therefore, hold so much of the Bankruptcy Act of 1978 as enables a Bankruptcy Court to entertain and decide Northern's lawsuit over Marathon's objection to be violative of Art. III of the United States Constitution" (emphasis added)); id. at 92, 102 S.Ct. at 2882 (Burger, C.J., dissenting) ("the Court's holding is limited to the proposition stated by Justice Rehnquist in his concurrence in the judgment — that a `traditional' state common-law action, not made subject to a federal rule of decision, and related only peripherally to an adjudication of bankruptcy under federal law, must, absent the consent of the litigants, be heard by an `Article III court'" (emphasis added)); id. at 95, 102 S.Ct. at 2884 (White, J., dissenting) (under the majority's interpretation, state law claims "would have to be heard by Art. III judges or by state courts — unless the defendant consents to suit before the bankruptcy judge — just as they were before the 1978 Act was adopted" (emphasis added)). See also McCabe, The Federal Magistrate Act of 1979, 16 Harv.J.Legis. 343, 374-79 (1979); Silberman, Masters and Magistrates Part II: The American Analogue, 50 N.Y.U.L.Rev. 1297, 1350-54 (1975); Comment, An Adjudicative Role for Federal Magistrates in Civil Cases, 40 U.Chi.L.Rev. 584 (1973) (all arguing that litigant consent solves any Article III constitutional problems under the new Magistrate Act). The Third Circuit has concluded that consent under § 636(c) cures any constitutional defects, Wharton-Thomas v. United States, 721 F.2d 922, 925-926 (3d Cir. 1983), and that conclusion is entitled to deference.
We also give considerable weight to the judgment of Congress that consent of the parties eliminates constitutional objections. The House Committee gave explicit consideration to the issue of constitutionality, and concluded that consent of the parties suffices to overcome objections based on constitutional grounds. Compare H.R. Rep. No. 287, 96th Cong., 1st Sess. 7-9 (1979) (House Committee confident that the Magistrate Act passes constitutional muster) with H.R.Rep. No. 595, 95th Cong. 1st Sess., 36-39 (1977), reprinted in 1978 U.S. Code Cong. Ad.News, 5787, 5963, 5997-6000; and, Staff of House Subcommittee on Civil and Constitutional Rights, Committee on the Judiciary, 95th Cong., 1st Sess., Constitutional Bankruptcy Courts 33 (Committee Print 1977) (same Committee expressing substantial doubts about the constitutionality of the Bankruptcy Reform Act the Supreme Court subsequently struck down in Northern Pipeline).
The Supreme Court has allowed criminal defendants to waive even fundamental rights: the right to be free from self-incrimination, Garner v. United States, 424 U.S. 648, 96 S.Ct. 1178, 47 L.Ed.2d 370 (1976), the right to counsel, Adams v. United States ex rel. McCann, 317 U.S. 269, 63 S.Ct. 236, 87 L.Ed. 268 (1942), the right to be free from unreasonable searches and seizures, Schneckloth v. Bustamonte, 412 U.S. 218, 93 S.Ct. 2041, 36 L.Ed.2d 854 (1973), the right to a speedy trial, Barker v. Wingo, 407 U.S. 514, 92 S.Ct. 2182, 33 L.Ed.2d 101 (1972), the right to a jury trial, Duncan v. Louisiana, 391 U.S. 145, 158, 88 S.Ct. 1444, 1452, 20 L.Ed.2d 491 (1968), and even, by pleading guilty, the right to trial itself. See Boykin v. Alabama, 395 U.S. 238, 243, 89 S.Ct. 1709, 1712, 23 L.Ed.2d 274 (1969). We refuse to reach the anomalous result of forbidding waiver in a civil case of the personal right to an Article III judge.
The waiver of personal rights must, of course, be freely and voluntarily undertaken. The present statute recognizes the importance of this requirement and provides that "[r]ules of court for the reference of civil matters to magistrates shall include procedures to protect the voluntariness of the parties' consent." 28 U.S.C. § 636(c)(2). The local rules of the District of Oregon pertaining to the assignment of civil cases to magistrates meet this requirement.
The purported waiver of the right to an Article III trial would not be an acceptable ground for avoiding the constitutional question if the alternative to the waiver were the imposition of serious burdens and costs on the litigant. If it were shown that the choice is between trial to a magistrate or the endurance of delay or other measurable hardships not clearly justified by the needs of judicial administration, we would be required to consider whether the right to an Article III forum had been voluntarily relinquished. No such burdens or hardships have been demonstrated here. Access to district judges in the current judicial system is not so restricted that adjudication of cases by magistrates is a compelled alternative.
Pacemaker argues that in the federal system a party may not consent to jurisdiction, so that the parties cannot waive their rights under Article III. The maxim that parties may not consent to the jurisdiction of federal courts is not applicable here. The rule is irrelevant because it applies only where the parties attempt to confer upon an Article III court a subject matter jurisdiction that Congress or the Constitution forbid. See, e.g., Jackson v. Ashton, 33 U.S. (8 Peters), 148, 148-49, 8 L.Ed. 898 (1834); Mansfield, Coldwater Lake Michigan Railway Co. v. Swan, 111 U.S. 379, 4 S.Ct. 510, 28 L.Ed. 462 (1884). The limited jurisdiction of the federal courts and the need to respect the boundaries of federalism underlie the rule. In the instant case, however, the subject matter, patents, is exclusively one of federal law. The Supreme Court has explicitly held that Congress may "confer upon federal courts jurisdiction conditioned upon a defendant's consent." Williams v. Austrian, 331 U.S. 642, 652, 67 S.Ct. 1443, 1448, 91 L.Ed. 1718 (1947); see Harris v. Avery Brundage Co., 305 U.S. 160, 59 S.Ct. 131, 83 L.Ed. 100 (1938). The litigant waiver in this case is similar to waiver of a defect in jurisdiction over the person, a waiver federal courts permit. Hoffman v. Blaski, 363 U.S. 335, 343, 80 S.Ct. 1084, 1089, 4 L.Ed.2d 1254 (1960).
The maxim also begs the essential question, whether jurisdiction can be conferred on the magistrate. The issue is not the expansion of Article III jurisdiction but its transfer to another federal forum. The component of the separation of powers rule that protects the integrity of the constitutional structure, as distinct from the component that protects the rights of the litigants, cannot be waived by the parties, but that analysis requires us to address questions more fundamental than the irrelevant rule that jurisdiction cannot be conferred by the parties. We now address those concerns.
On its most fundamental plane, the separation of powers doctrine protects the whole constitutional structure by requiring that each branch retain its essential powers and independence. Buckley v. Valeo, 424 U.S. 1, 120, 96 S.Ct. 612, 682-83, 46 L.Ed.2d 659 (1976); Chadha v. INS, 634 F.2d at 425 (9th Cir. 1980), aff'd, ___ U.S. ___, 103 S.Ct. 2764, 77 L.Ed.2d 317 (1983). Statutes or governmental actions which violate the separation of powers doctrine in its systemic aspect should be invalidated, as a general rule, despite waiver by affected private parties. Here the statute requires entry and enforcement of judgments in an Article III court after a non-Article III judicial officer has heard the suit. The procedure raises at least two concerns for the integrity of the judiciary. The first is whether, by providing for reference of court cases to a magistrate, Congress has invaded the power of a coordinate branch or permitted an improper abdication of that branch's central authority. See, e.g., Buckley v. Valeo, 424 U.S. 1, 120-43, 96 S.Ct. 612, 682-94, 46 L.Ed.2d 659 (1976); Schechter Poultry Corp. v. United States, 295 U.S. 495, 529-42, 55 S.Ct. 837, 842-48, 79 L.Ed. 1570 (1935); the second is whether the requirement for entry of judgment improperly directs the judiciary in the performance of its duties. See United States v. Klein, 80 U.S. (13 Wall.) 128, 20 L.Ed. 519 (1871); cf. California Medical Ass'n v. Federal Election Comm'n, 641 F.2d 619, 631-32 (9th Cir. 1980) (en banc) (statutory provision requiring en banc consideration of cases arising under Federal Election Campaign Act may present constitutional questions), aff'd, 453 U.S. 182, 101 S.Ct. 2712, 69 L.Ed.2d 567 (1981).
The standard for determining whether there is an improper interference with or delegation of the independent power of a branch is whether the alteration prevents or substantially impairs performance by the branch of its essential role in the constitutional system. Nixon v. Administrator of General Services, 433 U.S. 425, 443, 97 S.Ct. 2777, 2790, 53 L.Ed.2d 867 (1977). There is little guidance in the cases beyond this broad formulation, but the general rule can be narrowed for the case before us. If the essential, constitutional role of the judiciary is to be maintained, there must be both the appearance and the reality of control by Article III judges over the interpretation, declaration, and application of federal law. See Northern Pipeline Construction Co. v. Marathon Pipe Line Co., 458 U.S. 50, 76-81, 102 S.Ct. 2858, 2874-77, 73 L.Ed.2d 598 (1982); United States v. Raddatz, 447 U.S. 667, 685, 100 S.Ct. 2406, 2417, 65 L.Ed.2d 424 (1980) (Blackmun, J., concurring). The required control must be more than simple appellate review. This is the teaching of Northern Pipeline. 458 U.S. at 86, n. 39, 102 S.Ct. at 2879, n. 39.
Ours is not the paradigmatic separation of powers case, where the integrity of one branch is threatened by another which attempts an arrogation of power to itself. E.g., Buckley v. Valeo, 424 U.S. 1, 120, 96 S.Ct. 612, 682-83, 46 L.Ed.2d 659 (1976); Youngstown Steel Tube v. Sawyer, 343 U.S. 579, 72 S.Ct. 863, 96 L.Ed. 1153 (1952). The potential for disruption is instead the erosion of the central powers of the judiciary by permitting it to delegate its own authority. Upon examination of the statute before us, we conclude that it contains sufficient protection against the erosion of judicial power to overcome the constitutional objections leveled against it. The statute invests the Article III judiciary with extensive administrative control over the management, composition, and operation of the magistrate system. It permits, moreover, control over specific cases by the resumption of district court jurisdiction on the court's own initiative.
Article III courts control the magistrate system as a whole. The statutory scheme created by Congress protects against intervention by political branches of government. The Judicial Conference of the United States, composed exclusively of Article III judges, see 28 U.S.C. § 331 (1976), determines the number of magistrate positions for each district, 28 U.S.C. § 633(b), protecting against the designation of so many magistrates that effective judicial control is lost. We must acknowledge that the exclusive character of Article III control in this one aspect of the statute will lose considerable force under an amendment effective April 1984, when bankruptcy judges, non-Article III officers, are included within the Judicial Conference of the United States. 28 U.S.C. § 331 (Supp. V 1981). There are enough other aspects of exclusive judicial control so that this change should not alter our conclusion, though it does detract from the constitutional symmetry of the Magistrate Act.
Selection of magistrates and their retention in office, under statutory standards relating to performance and fitness, is the responsibility of Article III judges, as it is vested in the judges of the separate districts. 28 U.S.C. § 631. Magistrates thus are not made directly dependent upon loyalty to officers in either of the political branches.
The congressional designation of Article III judges to select and to appoint magistrates as subordinate officers is not the mark of an aberrant procedure. To the contrary, the Constitution contains explicit, textual authority for the judiciary to appoint its own officers, if the Congress so permits. Article II, section 2 provides that "the Congress may by law vest the appointment of such inferior officers, as they think proper, or in the President alone, in the Courts of Law, or in the Heads of Departments." See Go-Bart Importing Co. v. United States, 282 U.S. 344, 352-53, 51 S.Ct. 153, 156-57, 75 L.Ed. 374 (1931) (commissioners are inferior officers); Rice v. Ames, 180 U.S. 371, 378, 21 S.Ct. 406, 409, 45 L.Ed. 577 (1901) (Congress may authorize judges to appoint commissioners). This constitutional authority for the exercise of the appointment power by Article III judges implies an important dimension to the judicial power: the judiciary is permitted a degree of control and discretion for the design and shape of its own system. The Magistrates Act implements this constitutional authority.
In addition to judicial supervision over the magistrate system as a whole, there is a further element of judicial control in the Article III authority to cancel an order of reference, sua sponte or on application of the parties, in individual cases. 28 U.S.C. § 636(c)(6). The district court's power to void a reference sua sponte is predicated upon good cause, a term yet to be explored in the context of specific cases. It would seem at a minimum, however, that good cause for resumption of direct Article III control exists in a case where a political branch of the government is directly affected, or where a substantial constitutional question is presented, or where rights of numerous parties not present before the court might be affected by the decision, or in any other case containing sensitivities such that determination by an Article III judge is required to insure the appearance and the reality of independence and impartiality in the decision. See S.Rep. No. 74, 96th Cong., 1st Sess. 14, reprinted in 1979 U.S.Code Cong. Ad.News 1469, 1483. By contrast, certain early Supreme Court cases, while not explicitly addressed to separation of powers concerns, support the proposition that consensual reference to non-Article III judges is permitted in some types of cases. E.g., Kimberly v. Arms, 129 U.S. 512, 9 S.Ct. 355, 32 L.Ed. 764 (1889) (ownership interest in stock); Newcomb v. Wood, 97 U.S. (7 Otto) 581, 24 L.Ed. 1085 (1878) (restitution for goods sold to bankrupt); Heckers v. Fowler, 69 U.S. (2 Wall.) 123, 17 L.Ed. 759 (1864) (breach of a patent license and defense of invalidity of patent); Alexandria Canal Co. v. Swann, 46 U.S. (5 How.) 83, 12 L.Ed. 60 (1847) (trespass to land).
Article III authority is preserved in other respects. District courts retain the power to adjudge a party in contempt. 28 U.S.C. § 636(e). Sections 636(c)(3) and (4) provide for appellate review of the judgment of the magistrate by the appropriate court of appeals as a matter of right or, if the parties consent, by the district court. 28 U.S.C. § 636(c)(3), (4). The Act imposes no limits on review by the Supreme Court. 28 U.S.C. § 636(c)(3), (5). Article III courts retain full authority over questions of law.
The power to cancel a reference, taken together with the retention by Article III judges of the power to designate magistrate positions and to select and remove individual magistrates, provides Article III courts with continuing, plenary responsibility for the administration of the judicial business of the United States. This responsibility sufficiently protects the judiciary from the encroachment of other branches to satisfy the separation of powers embodied in Article III.
It is instructive to compare and contrast reference of civil cases to a magistrate under § 636(c), the provision at issue here, with the statutory scheme providing for de novo review of a magistrate's determination under § 636(b), the system upheld by the Supreme Court in United States v. Raddatz, 447 U.S. 667, 100 S.Ct. 2406, 65 L.Ed.2d 424 (1980). We must recognize that neither section insures full Article III participation in the decision of every case. Each has its own potential defects and comparative advantages. The merit of the de novo determination scheme lies in the duty of the district court to make its own determinations of magistrate rulings to which the parties object, 28 U.S.C. § 636(b)(1); but the defect inherent is the lack of assurance that the full power of the district court will be exercised to rehear the evidence on credibility issues that may be central in the case. See United States v. Raddatz, 447 U.S. at 683 n. 11, 100 S.Ct. at 2416 n. 11. Under the de novo determination rule, the district court may give some deference to the findings of magistrates. Id. The plan contains at least the potential for district judges to engage in routine and cursory examinations, so that decisions nominally made by district judges will in fact be those of the magistrate. The identity of the officer responsible for the decision may be unclear to the public or to the litigants. Where the responsibility becomes blurred, power may be either abused or too timidly exercised. See Note, Article III Constraints and the Expanding Civil Jurisdiction of Federal Magistrates: A Dissenting View, 88 Yale L.J. 1023, 1047-58 (1979).
The consensual case reference scheme, before us here, provides a much better delineation of the decisional process. There should be little danger that litigants or the public will be confused over whether the magistrate or the district judge has decided the case. The principal disadvantage of the consensual reference plan may arise in the tendency to overuse it. Even if the number of magistrates and case referrals become substantially greater than it is now, there must be active supervision by Article III judges. The statutory safeguards are the power of the district judges to cancel references for good cause, and the requirement of litigant consent. 28 U.S.C. § 636(c)(1), (2), (6). Continued and vigilant supervision by Article III judges is of course essential to the integrity of the system, and they must be careful to guard against any compulsion to induce consent through the imposition of costs, delays, or other penalties which would be incompatible with the foregoing conclusion that the consent of the parties is essential to the constitutionality of the Act.
At this stage in the evolution of the magistrate system, however, we cannot say the Congress was constitutionally compelled to rely on the de novo determination plan approved in Raddatz to the exclusion of the consensual case reference system under examination here. There are adequate protections in the statute so that it is not invalid on its face or as applied in the present structure of the judicial system.
From a realistic and practical perspective, reference of civil cases to magistrates with the consent of the parties, subject to careful supervision by Article III judges, may serve to strengthen an independent judiciary, not undermine it. The Constitution is not simply an exercise in metaphysics. The idea of separation of powers is justified by eminently practical considerations. See The Federalist No. 51 (J. Madison) at 349 (J. Cooke ed. 1961); Chadha v. INS, 634 F.2d at 423-24. It is faithful to the idea of separation of powers to examine the real consequences of the statute.
There are compelling reasons for the creation of an infrastructure for determining certain civil cases with the consent of the parties and subject to judicial control. Article III courts have the task of adjudicating an ever-mounting volume of cases, see Administrative Office of the United States Courts, Federal Court Management Statistics 1983 (1983). Further, the entire character of litigation that federal courts principally face is changing. Chayes, The Supreme Court 1981 Term — Foreword: Public Law Litigation and the Burger Court, 96 Harv.L.Rev. 4 (1982). The legislature and the judiciary act responsibly when they provide and explore new, flexible methods of adjudication, especially where the evolution of the innovative mechanism is left in large part under the control of the judiciary itself. The Magistrate Act was shaped by these considerations. See S.Rep. No. 74, 96th Cong., 1st Sess. 4-5, reprinted in 1979 U.S.Code Cong. Ad. News 1469, 1472-74.
The patent dispute here required an explanation of the elements of design and the mechanics of a complex computer system used to monitor the performance of artificial implants for sustaining the heartbeat. While we have not examined the validity of the legal conclusions drawn by the magistrate, in the course of a 28 page opinion he gave a meticulous explanation of these matters. The procedure is hardly an affront to the constitutional system where the parties have consented to it. In these circumstances, the case is not one necessarily calling for adjudication by a judge with the protections of Article III.
We hold that consensual reference of a civil case to a magistrate is constitutional, and we remand to the three judge panel of this court to decide the substantive issues of patent law on appeal.