ARMSTRONG, P.J.

This case arises out of a helicopter crash in Peru that resulted in the death of everyone on board, including eight Peruvian passengers. Plaintiffs, the personal representatives of the estates of the passengers, brought wrongful death actions in Oregon against Evergreen Helicopters, Inc. (Evergreen), an Oregon corporation that was the lessor of the helicopter and employer of the pilot. The trial court granted Evergreen's motions to dismiss plaintiffs' actions based on its conclusion that Peru was the more convenient forum in which to litigate plaintiffs' claims. In this appeal, we are asked to decide whether dismissal based on the inconvenient-forum doctrine, ox forum non conveniens, is available in Oregon, and, if it is, what standards apply to govern a trial court's application of the doctrine. Those are questions of first impression for us because no Oregon appellate court has directly confronted them before. We conclude that the inconvenient-forum doctrine is available, such that an Oregon trial court may decline to exercise its jurisdiction to try a case — based on considerations of convenience and justice — when an adequate, alternative forum is presently available in which to try the case. However, because we also conclude that the trial court relied on inappropriate factors to dismiss plaintiffs' actions, we vacate and remand to the trial court with instructions to reconsider its decision in light of our opinion.

Plaintiffs are the appointed personal representatives of the estates of eight people who died in a helicopter crash in Peru that occurred when they were being transported to a mining site during inclement weather. All eight decedents, and their personal representatives, are citizens of Peru. Evergreen is an Oregon corporation headquartered in Oregon. Evergreen acquired the subject helicopter through a sublease agreement and, in turn, leased the helicopter to a Canadian subsidiary of Helinka, a Peruvian company, which then subleased the helicopter to Helinka for use in Peru. As part of the sublease agreement, Evergreen provided pilots and maintenance personnel to work in Peru. The lead pilot of the helicopter on the day of the crash was an employee of Evergreen working in Peru under that arrangement.

Plaintiffs brought their wrongful death actions in Multnomah County, Oregon, against Evergreen based on theories of Evergreen's direct and vicarious liability in negligence for the crash.1 In their complaints, seven of the plaintiffs alleged that Evergreen was negligent in the following ways:

The eighth plaintiff, Brenda Vilma Hoyle De Castro, alleged that Evergreen was negligent in the following ways:

Evergreen moved to dismiss plaintiffs' actions under the inconvenient-forum doctrine, arguing that Peru is the more convenient forum in which to litigate plaintiffs' claims because the majority of witnesses and documents, as well as potential third-party defendants, are located in Peru and because Peruvian law should control. Plaintiffs conceded that Peru is an adequate, alternative forum, as long as Peru's applicable statute of limitation did not bar the action, but opposed the motion on several other grounds. Plaintiffs' arguments included that the inconvenient-forum doctrine is not available in Oregon, and, even if it were, dismissal is inappropriate in this case because witnesses and documents relevant to plaintiffs' claims are located in Oregon or elsewhere in the United States and because Oregon law should apply.

The trial court concluded that the inconvenient-forum doctrine was available and that it "grants the trial court discretion to dismiss an otherwise properly filed case if the court determines that an adequate alternative forum exists and that trying the action elsewhere would best serve the convenience of the parties and the ends of justice." In its letter opinion, the trial court found and concluded as follows:

In its dismissal order, the trial court specified the following conditions:

The trial court entered a general judgment of dismissal in favor of Evergreen and dismissed plaintiffs' claims against Evergreen "without prejudice to their maintenance in Peruvian court(s) and subject to the Court's September 17, 2010 Order and the conditions stated therein."

On appeal, plaintiffs assert three assignments of error: (1) The trial court committed legal error when it concluded that the inconvenient-forum doctrine is available in Oregon as a means by which a trial court can decline to exercise its jurisdiction over a case. (2) The trial court committed legal error when it applied the factors from Piper Aircraft Co. v. Reyno, 454 U.S. 235, 102 S.Ct. 252, 70 L.Ed.2d 419 (1981), to determine if dismissal was appropriate in this case. (3) The trial court abused its discretion by concluding that, under the Piper factors, Peru was an adequate alternative forum and that the public- and private-interest factors favored trying the case in Peru and in basing its decision on its imposition of unenforceable conditions against a foreign court.

To place our discussion in context, we begin with a brief overview of the inconvenient-forum doctrine, also commonly known by its Latin name — forum non conveniens. That doctrine allows a court to dismiss an action over which it has jurisdiction and venue if trying the action in an alternative forum would "best serve the convenience of the parties and the ends of justice." Novich v. McClean, 172 Or.App. 241, 251, 18 P.3d 424 (2001) (internal quotation marks omitted); see also Koster v. (American) Lumbermens Mutual Casualty Co., 330 U.S. 518, 527, 67 S.Ct. 828, 91 L.Ed. 1067 (1947) ("[T]he ultimate inquiry is where trial will best serve the convenience of the parties and the ends of justice."). "[T]he dismissal of a case for forum non conveniens presumes that the trial court has jurisdiction, but defers its jurisdiction in favor of the jurisdiction of another court." Maricich v. Lacoss, 204 Or.App. 61, 65-66, 129 P.3d 193 (2006); see also Gulf Oil Corp. v. Gilbert, 330 U.S. 501, 506-07, 67 S.Ct. 839, 91 L.Ed. 1055 (1947) ("In all cases in which the doctrine of forum non conveniens comes into play, it presupposes at least two forums in which the defendant is amendable to process; the doctrine furnishes criteria for choice between them."); American Dredging Co. v. Miller, 510 U.S. 443, 453, 114 S.Ct. 981, 127 L.Ed.2d 285 (1994) ("At bottom, the doctrine of forum non conveniens is nothing more or less than a supervening venue provision, permitting displacement of the ordinary rules of venue when, in light of certain conditions, the trial court thinks that jurisdiction ought to be declined."). A court that dismisses an action under the inconvenient-forum doctrine does so under its inherent power to decline to exercise its jurisdiction to try a case in favor of an alternative forum based on considerations of convenience and justice.

The purpose underlying the inconvenient-forum doctrine "is to root out cases in which the `open door' of broad jurisdiction and venue laws `may admit those who seek not simply justice but perhaps justice blended with some harassment,' and particularly cases in which a plaintiff resorts `to a strategy of forcing the trial at a most inconvenient place for an adversary.'" Carijano v. Occidental Petroleum Corp., 643 F.3d 1216, 1224 (9th Cir.2011), reh'g en banc den., 686 F.3d 1027 (2012), cert den., ___ U.S. ___, 133 S.Ct. 1996, 185 L.Ed.2d 865 (2013) (quoting Gulf Oil, 330 U.S. at 507, 67 S.Ct. 839). It is a doctrine that is reserved for the rare case that exhibits extraordinary circumstances favoring dismissal, and "not a `doctrine that compels plaintiffs to choose the optimal forum for their claim.'" Id. (quoting Dole Food Co. v. Watts, 303 F.3d 1104, 1118 (9th Cir. 2002)).

Plaintiffs' primary argument supporting its assertion that the inconvenient-forum doctrine is not available in Oregon is that Oregon courts do not have discretion to decline to exercise jurisdiction over a case, once jurisdiction is properly established. For their argument, plaintiffs rely almost exclusively on the 1928 case of State ex rel. Kahn v. Tazwell, 125 Or. 528, 266 P. 238 (1928), overruled in part by Reeves v. Chem Industrial Co., 262 Or. 95, 495 P.2d 729 (1972). That case, however, is not helpful to plaintiffs' position.

In Kahn, the plaintiff, a citizen of Germany, had obtained an insurance policy in Germany from a company with an international insurance business. The representatives of the insurance company had signed the contract in New York and France. The plaintiff sued the insurance company on the contract in Oregon and served the complaint on the company's appointed attorney-in-fact in Oregon, which the company was required to appoint to do business in Oregon under the insurance statutes. 125 Or. at 531-32, 266 P. 238. The insurance contract also contained a provision that provided that, "[f]or the fulfillment of this contract[,] only the courts of Karlsruhe[, Germany,] are competent." Id. at 532, 266 P. 238. The trial court granted the insurance company's motion to quash service for lack of personal jurisdiction. The Oregon Supreme Court concluded that service upon the insurance company's attorney-in-fact in Oregon was sufficient to obtain personal jurisdiction of the company and subject matter jurisdiction of the action, and that the contract's forum-selection clause was void as contrary to public policy because the parties could not, by contract or stipulation, diminish the jurisdiction of Oregon courts. Id. at 542-43, 266 P. 238.2

Plaintiffs emphasize a statement by the Kahn court that "[s]ome courts, however, decline to take jurisdiction of a suit against a foreign corporation on a cause of action arising out of the state, especially where plaintiff is a nonresident," id. at 541, 266 P. 238, and argue that, because the court did not follow that minority view, the court necessarily rejected the idea that a court has inherent power to decline jurisdiction. However, plaintiffs' argument ignores the context of the court's observation, which was within a discussion about whether personal jurisdiction could be obtained over a corporation on a transitory action in any state where the corporation is doing business, and comparing the majority and minority view of courts on that question. Kahn solely addressed whether the trial court had personal and subject matter jurisdiction based on the service made on the company's Oregon agent under the insurance statutes, and in light of the contract clause attempting to place jurisdiction solely in the courts of Karlsruhe, Germany.3 Because it concluded that the trial court had both personal and subject matter jurisdiction of the case, the court issued a writ to the trial court to take that jurisdiction: "We are constrained to hold upon the weight and authority and reason that the Circuit Court has jurisdiction of the defendant * * * and of the subject of the action, and should entertain such jurisdiction and proceed with the hearing and determination of the action mentioned." Id. at 545. Kahn does not stand for the proposition that plaintiffs attribute to it.4

Indeed, as early as 1913 — 15 years before Kahn was decided — the Oregon Supreme Court had recognized the inherent power of courts to decline to exercise jurisdiction over cases that involved the internal affairs of foreign corporations. Beard v. Beard, 66 Or. 512, 517, 133 P. 797, reh'g den., 66 Or. 512, 134 P. 1196 (1913), overruled on other grounds by Mack Trucks, Inc. v. Taylor, 227 Or. 376, 362 P.2d 364 (1961). The purpose of the rule was "the protection of the foreign corporation." Id. at 518, 133 P. 797. Although not an expression of the inconvenient-forum doctrine, the doctrine discussed in Beard was a generally accepted rule in both state and federal courts that provided, in part, the basis for the United States Supreme Court to adopt the more general federal forum non conveniens doctrine in 1947. See Koster, 330 U.S. at 528, 67 S.Ct. 828 (quoting from Rogers v. Guaranty Trust Co. of New York, 288 U.S. 123, 53 S.Ct. 295, 77 L.Ed. 652 (1933), which discussed when a court should decline jurisdiction of stockholder suits involving the internal affairs of a foreign corporation). We and the Oregon Supreme Court also have recognized the inherent power of Oregon courts to decline their jurisdiction in other circumstances, including based on an enforceable forum-selection clause in a contract, Reeves v. Chem Industrial Co., 262 Or. 95, 100-01, 495 P.2d 729 (1972), considerations of comity, Kotera v. Daioh Int'l U.S.A. Corp., 179 Or.App. 253, 274, 40 P.3d 506 (2002), or the existence of a more appropriate remedy to a declaratory relief claim, League of Oregon Cities v. State of Oregon, 334 Or. 645, 652, 56 P.3d 892 (2002). Accordingly, we reject plaintiffs' argument that an Oregon court cannot decline in an appropriate case to exercise its jurisdiction.

Turning to the more specific issue, in 1940, the Oregon Supreme Court appeared to touch upon the inconvenient-forum doctrine in Horner v. Pleasant Creek Mining Corp., 165 Or. 683, 107 P.2d 989 (1940), reh'g den., 165 Or. 683, 109 P.2d 1044 (1941). In that case, the plaintiff, a minority stockholder, brought a suit against a mining corporation and the majority stockholders for fraudulent conspiracy to deprive him of money advanced to the corporation and to render his interest in the corporation valueless. The trial court entered a decree for the plaintiff and placed the corporation in receivership; the Supreme Court reversed, concluding that the record did not establish fraud or conspiracy. Id. at 699-703, 107 P.2d 989. After so concluding, the court then stated:

Id. at 703-04, 107 P.2d 989. Later, in a concurrence in State ex rel. Academy Press v. Beckett, 282 Or. 701, 722 n. 3, 581 P.2d 496 (1978) (Linde, J., concurring), Justice Linde cited to the above paragraph and noted, "It is not clearly established whether Oregon courts have similar discretion [to dismiss under forum non conveniens], although Horner * * * seems to hold that they do."

Based on Horner and Academy Press, Evergreen asserts that the Oregon Supreme Court in Horner confirmed the availability of the inconvenient-forum doctrine in Oregon. Plaintiffs dismiss Horner as mere dictum without confronting the case. Although we have, in passing, characterized the court's statement in Horner as dictum, see Novich, 172 Or.App. at 251 n. 4, 18 P.3d 424, Evergreen correctly points out that that was likely an improper characterization. In concluding that the trial court did not abuse its discretion in exercising its jurisdiction over the case, the Horner court resolved an assignment of error of a preliminary procedural matter that the court necessarily had to resolve to reach the merits of the plaintiff's fraud and conspiracy claims. We also note, however, that Horner was a stockholder suit involving the internal affairs of a Washington corporation, which, as discussed at 266 Or. App. at 37-38, 337 P.3d at 178-79, was an already established basis for an Oregon court to decline its jurisdiction, see Beard, 66 Or. at 517, 133 P. 797. Thus, it is not clear if Horner speaks to the precise issue before us. Nonetheless, the court in Horner did, at a minimum, recognize that the doctrine in Beard — an important precursor to the adoption of federal forum non conveniens — remained good law in Oregon, even if it did not provide a basis for reversal in that case.

Since Horner, we and the Oregon Supreme Court have on several occasions discussed or noted the existence of the inconvenient-forum doctrine without formally adopting it as available in Oregon. See State ex rel Hydraulic Servocontrols v. Dale, 294 Or. 381, 390 n. 5, 657 P.2d 211 (1982) (noting that "Hydraulic's objection may pose a forum non conveniens problem when the accident occurred elsewhere, * * * but it is not dispositive of the personal jurisdiction issue in this case"); Academy Press, 282 Or. at 722 n. 3, 581 P.2d 496 (Linde, J., concurring); Reeves, 262 Or. at 100, 495 P.2d 729 ("But a court is not always required to exercise such jurisdiction as it may possess. Courts often refuse to hear a case because of [f]orum non conveniens considerations."); Berger v. Stephan, 241 Or.App. 399, 412, 250 P.3d 954 (2011) (summarily rejecting the defendants' contention that Oregon was an inconvenient forum because it was premised on an incorrect assertion about the basis for the plaintiffs' claim); Maricich, 204 Or.App. at 66, 129 P.3d 193 (reversing trial court dismissal for forum non conveniens because the court failed to first determine that it had jurisdiction); Black v. Arizala, 182 Or.App. 16, 38 n. 8, 48 P.3d 843 (2002), aff'd, 337 Or. 250, 95 P.3d 1109 (2004) (Armstrong, J., concurring) (noting that "our forum non conveniens cases show" that the court can create adequate judicial procedures when there is not an adequate statutory procedure); Kotera, 179 Or. App. at 274, 40 P.3d 506 ("Similarly, the relative convenience of the courts of different nations plays a part in the comity determination, but the fact that the inconvenient[-]forum doctrine might be applicable in a particular case does not preclude application of the doctrine of comity to that same case."); Novich, 172 Or.App. at 251-52, 18 P.3d 424 (assuming, without deciding, that the inconvenient-forum doctrine is available and reversing the trial court's dismissal because it failed to identify an adequate alternative forum); C.O.W. Inc. v. M.V.D., 37 Or.App. 73, 75 n. 2, 586 P.2d 107, rev. den., (1978) ("While a court having jurisdiction may decline to exercise it on the basis of [f]orum non conveniens * * *, absent jurisdiction, the issue cannot be reached.").

Plaintiffs have not convinced us that the inconvenient-forum doctrine is not available to Oregon courts as part of those courts' already recognized inherent power to decline jurisdiction in appropriate cases. Indeed, at least a variant of the doctrine had been employed by Oregon trial courts and approved by the Oregon Supreme Court since 1913-the date that Beard was decided. In addition, the Oregon Supreme Court has signaled the availability of the doctrine and has expressly approved a court's authority to decline jurisdiction through enforcement of a forum-selection clause in a contract, Reeves, 262 Or. at 96-101, 495 P.2d 729, which "is close in concept to forum non conveniens," Black, 182 Or.App. at 38, 48 P.3d 843 (Armstrong, J., concurring). Oregon appellate courts having implicitly affirmed the exercise of discretion by trial courts to decline jurisdiction based on the inconvenient-forum doctrine, we now take this opportunity to confirm that authority explicitly. In doing so, we decline plaintiffs' invitation to leave the decision to the legislature, which has not spoken on the matter.5 See Weldon v. Bd. of Lic. Pro. Counselors and Therapists, 353 Or. 85, 100, 293 P.3d 1023 (2012) (stating that the court is reluctant to infer from the legislature's silence an intention to deprive courts of inherent authority to address procedural matters). As amplified below, an Oregon trial court may, in the rare case, decline to exercise its jurisdiction to try a case, if to do so would "best serve the convenience of the parties and the ends of justice." Koster, 330 U.S. at 527, 67 S.Ct. 828.

Having determined that the inconvenient-forum doctrine is available to an Oregon court, we turn to plaintiffs' second assignment of error, in which they contend that the trial court erred when it applied to this case the federal forum non conveniens factors outlined in Gulf Oil and Piper. Evergreen argues that plaintiffs' assignment is unpreserved or invited error that we should not address on appeal. Evergreen points out that plaintiffs did not argue below that a different standard from that articulated in Gulf Oil and Piper should be applied in deciding whether to dismiss a case under the inconvenient-forum doctrine, but instead argued, based on the federal factors, that plaintiffs cases should not be dismissed. Although Evergreen is correct on that point, we believe that the issue was sufficiently preserved for our review.

In the trial court, plaintiffs expressly framed their argument in terms of the federal factors because, they noted, no recognized Oregon standard exists. However, plaintiffs also argued for departures from Piper in their discussion of its application to this case. Specifically, plaintiffs argued that their choice of forum should not be given less deference due to their status as foreign plaintiffs; that Evergreen has a heavy burden to establish oppression and vexation out of proportion to plaintiffs' convenience; and that the trial court should not rely on public-interest factors to dismiss a case, but should focus, instead, on private-interest factors in determining convenience. Plaintiffs now make those same arguments on appeal as considerations that we should adopt in crafting an Oregon-specific inconvenient-forum doctrine. Accordingly, we conclude that plaintiffs sufficiently preserved those arguments for appeal.6 In addition, we find it appropriate to discuss the factors that Oregon courts must apply, now that we have announced for the first time that a dismissal based on the inconvenient-forum doctrine is available in Oregon.

Turning to those factors, we first emphasize the caution that an Oregon court must take before dismissing a case based on the inconvenient-forum doctrine. As well expressed by the Ninth Circuit Court of Appeals,

Carijano, 643 F.3d at 1224 (quoting Dole Food Co., 303 F.3d at 1118) (internal quotations omitted in Carijano). A defendant seeking dismissal based on the inconvenient-forum doctrine bears the burden of demonstrating, first, that an alternative forum is presently available and adequate, Novich, 172 Or.App. at 252, 18 P.3d 424, and, second, that considerations of convenience and justice so outweigh the plaintiffs' choice of forum that the action should be dismissed.

As to the first showing, whether an alternative forum is presently adequate, the defendant must demonstrate that "(1) the defendant is amenable to process there; and (2) the other jurisdiction offers a satisfactory remedy." Carijano, 643 F.3d at 1225; see also Novich, 172 Or.App. at 252, 18 P.3d 424 (holding that an alternative forum is not adequate when the statute of limitation has run in that forum on plaintiffs' claims); Piper, 454 U.S. at 254 n. 22, 102 S.Ct. 252 ("[F]or example, dismissal would not be appropriate where the alternative forum does not permit litigation of the subject matter of the dispute."). That is a determination that the trial court must make on a case-by-case basis.

Turning to considerations of convenience and justice, we agree generally that the private- and public-interest factors outlined in Gulf Oil are appropriate considerations for Oregon courts to apply. Although other considerations may be taken into account under the particular circumstances of a case, a court should look at all of the factors outlined below and not focus unduly on only one or two factors, such as the relative location of witnesses and evidence in the two potential forums. The private-interest factors that a court may consider include

Gulf Oil, 330 U.S. at 508, 67 S.Ct. 839. As to the public-interest factors, the court in Gulf Oil explained:

Id. at 508-09, 67 S.Ct. 839. Although we agree that the public-interest factors should play some role in the trial court's consideration, in the typical case they will not be as important as the private-interest factors.

We again emphasize that, in weighing the private- and public-interest factors, the trial court must conclude that the defendant has demonstrated that the balance is strongly in favor of dismissal — a heavy burden that will likely require a showing that the plaintiffs' choice of forum is vexatious, harassing, or oppressive to the defendant "by inflicting upon [the defendant] expense or trouble not necessary to his own right to pursue his remedy." Id. at 508, 67 S.Ct. 839. We also agree with the Ninth Circuit's observation that "[t]he mere fact that a case involves conduct or plaintiffs from overseas is not enough for dismissal." Carijano, 643 F.3d at 1224 (citing Tuazon v. R.J. Reynolds Tobacco Co., 433 F.3d 1163, 1181-82 (9th Cir.2006) ("Juries routinely address subjects that are totally foreign to them, ranging from the foreign language of patent disputes to cases involving foreign companies, foreign cultures and foreign languages.")).

In adopting the factors outlined in Gulf Oil, we reject the discussion in Piper that a foreign plaintiff's choice of forum should be given less deference merely based on the plaintiff's status as a foreigner. It is a reasonable assumption that plaintiffs are in the best position to determine what is for them a convenient and appropriate forum in which to litigate their claims and that assumption becomes no less reasonable merely because plaintiffs are not residents of Oregon, nor citizens of the United States. But cf. Sinochem Int'l Co. Ltd. v. Malaysia Int'l Shipping Co., 549 U.S. 422, 430, 127 S.Ct. 1184, 167 L.Ed.2d 15 (2007) ("When the plaintiff's choice is not its home forum, however, the presumption in the plaintiff's favor `applies with less force,' for the assumption that the chosen forum is appropriate is in such cases `less reasonable.'"). It is particularly appropriate to accord the plaintiff the same deference as a resident plaintiff when the choice of forum, such as in this case, is the home forum of the defendant and has a connection to the subject matter of the case. See Carijano, 643 F.3d at 1229 ("Concerns about forum shopping, while appropriately considered in the forum non conveniens analysis, are muted in a case such as this where [p]laintiffs' chosen forum is both the defendant's home jurisdiction, and a forum with a strong connection to the subject matter of the case.").

With that legal background in place, we turn to the trial court's decision in this case. Because a motion to dismiss based on the inconvenient-forum doctrine may require the trial court to make findings of fact relevant to the inquiry, "[w]e review the trial court's factual findings to determine whether they are supported by any competent evidence, and, where the trial court failed to make express factual findings, we assume that the court found the relevant facts in a manner consistent with its ultimate ruling." Munson v. Valley Energy Investment Fund, 264 Or.App. 679, 700-01, 333 P.3d 1102 (2014) (internal quotation marks omitted) (describing standard of review of findings supporting a grant of a motion to dismiss for lack of personal jurisdiction). But see id. at 695, 333 P.3d 1102 ("[W]hen considering a motion to dismiss for lack of subject matter jurisdiction, the trial court may decide disputed jurisdictional facts based on evidence submitted by the parties, but the court may not, at that stage, decide disputed facts that go to the merits of the underlying claim because to do so would deprive a party of its entitlement to a trial `on disputed questions of material fact.'" (Quoting Black, 337 Or. at 265, 95 P.3d 1109.)).

We review the trial court's decision on a motion to dismiss based on an inconvenient forum for an abuse of discretion. See Gulf Oil, 330 U.S. at 512, 67 S.Ct. 839 (decision to dismiss based on forum non conveniens is within sound discretion of trial court); Horner, 165 Or. at 704, 107 P.2d 989 ("[T]he assumption of jurisdiction in such a case as this is a matter within the sound judicial discretion of the trial court; and when such discretion has not been abused, the action of the trial court does not afford ground for reversal.").

State v. Romero, 236 Or.App. 640, 643-44, 237 P.3d 894 (2010). In the context of the inconvenient-forum doctrine, a trial court abuses its discretion if it relies on an erroneous view of the law, relies on findings unsupported by the record, or strikes a clearly unreasonable balance of the relevant factors. See Forsi v. Hildahl, 194 Or.App. 648, 652, 96 P.3d 852 (2004), rev. den., 338 Or. 124, 108 P.3d 1173 (2005) ("The trial court abuses its discretion if it exercises that discretion in a manner that is unjustified by, and clearly against, reason and evidence."); Carijano, 643 F.3d at 1224 ("In the forum non conveniens context, a `district court may abuse its discretion by relying on an erroneous view of the law, by relying on a clearly erroneous assessment of the evidence, or by striking an unreasonable balance of relevant factors.'" (Quoting Ravelo Monegro v. Rosa, 211 F.3d 509, 511 (9th Cir.2000), cert. den., 531 U.S. 1112, 121 S.Ct. 857, 148 L.Ed.2d 771 (2001).)).

Under the first step of the inconvenient-forum inquiry, the trial court concluded that Peru was an adequate, alternative forum:

Plaintiffs argue on appeal that Peru is not an adequate forum because the applicable Peruvian statute of limitation has expired, and Evergreen cannot make Peru an adequate forum by agreeing to waive enforcement of the limitation statute. Plaintiffs also now assert on appeal that Peru is an inadequate forum because of travel conditions for American counsel and "institutional corruption, discrimination against indigenous and poor people, and retaliation against plaintiffs who seek redress in Peru's legal system."

Except for the running of the Peruvian statute of limitation, plaintiffs did not preserve any of their claims below, having conceded that Peru was an adequate forum. None of the conditions that plaintiffs now argue make Peru inadequate are conditions that occurred after entry of the order by the trial court, and, thus, plaintiffs could have raised them below in responding to Evergreen's motion. Evergreen also provided sufficient evidence that Peru is an adequate forum for plaintiffs' claims by submitting an expert's affidavits about the remedies available to plaintiffs in Peru. See also Carijano, 643 F.3d at 1226 (stating that "[t]o demonstrate that a foreign nation is an inadequate forum due to corruption, a party must make a `powerful showing' that includes specific evidence" and concluding that Peru was an adequate forum for the plaintiffs' claims).

With regard to plaintiffs' statute of limitation argument, we agree with the trial court that Evergreen's agreement to waive the limitation statute is sufficient. Evergreen's offer to waive the limitation statute was made in conjunction with the filing of its motions, and the trial court appropriately conditioned its judgment of dismissal on Evergreen following through on that offer and the courts in Peru accepting the waiver. Evergreen also provided the court with an expert affidavit stating that Peruvian courts would accept such a waiver. Cf. Novich, 172 Or.App. at 252-53, 18 P.3d 424 (holding alternative forum presently inadequate where statute of limitation had run, the defendant's offer to waive the statute of limitation was not made until oral argument on appeal, and the defendant had made no showing that a Mexican court would accept such a waiver). The trial court did not abuse its discretion in concluding that Peru offered a presently adequate, alternative forum for plaintiffs' claims.

Under the second step of the inconvenient-forum inquiry, the trial court considered the balance of private- and public-interest factors, presumably as outlined by the parties in their briefing, which was based on Gulf Oil and Piper. The trial court concluded that Peru was the more convenient forum based primarily on the trial court's assessment of which of plaintiffs' claims had more merit and the location of witnesses and evidence relative to that claim:

(Emphasis added.)

Plaintiffs argue on appeal that the trial court made an erroneous assessment of the evidence and struck a clearly unreasonable balance of factors because it relied on its conditional assessment (without the benefit of merits discovery) that plaintiffs direct-liability claim against Evergreen — negligent maintenance of the helicopter and its systems — would not be the focus of the litigation. Plaintiffs assert that it was too early in the litigation to determine whether the focus of trial would be on direct or vicarious liability, and the trial court improperly "disregarded the admission that only a handful of witnesses in Peru had any direct personal knowledge concerning the cause of the crash, and that most witnesses concerning [p]laintiffs' theory of the case for direct liability of [Evergreen] were in Oregon or the United States." (Footnotes omitted.)

Evergreen responds that the trial court correctly concluded that plaintiffs' direct-liability theory was speculative and unsupported by any evidence in the record. According to Evergreen, plaintiffs' proffered rule would result in a plaintiff being able to defeat an inconvenient-forum motion merely "by speculating that as yet undiscovered evidence might establish a stronger connection to the existing forum."

As a starting point for our discussion of the trial court's decision, we agree with the federal courts that a trial court should not merely focus on the number of witnesses in each location in assessing the convenience of a forum. "Instead, the court should * * * examine[] the materiality and importance of the anticipated witnesses' testimony and then determine[] their accessibility and convenience to the forum." Gates Learjet Corp. v. Jensen, 743 F.2d 1325, 1335-36 (9th Cir.1984). The burden remains on the defendant seeking to dismiss to demonstrate the materiality and importance of the witnesses and documents that it claims make the plaintiff's chosen forum inconvenient. In so doing, the trial court should also be mindful that "`the increased speed and ease of travel and communication * * * makes, especially when a key issue is the location of witnesses, no forum `as inconvenient [today] as it was in 1947,' when the Supreme Court decided [Gulf Oil].'" Id. (quoting Manu International, S.A. v. Avon Products, Inc., 641 F.2d 62, 65 (2d Cir.1981)) (alterations in Gates Learjet). That admonition is even more apt today than when it was made in 1981.

Here, the trial court attempted to assess the convenience of the respective forums based on what it believed the focus of the case would be — the circumstances in Peru at the time of the crash — and where the witnesses and documents relevant to that focus were located. However, in making that determination, the trial court appears to have completely disregarded plaintiffs' claims based on Evergreen's direct negligence as supported by witnesses and documents located in the United States. The trial court must assess the materiality of witnesses and evidence with respect to plaintiffs' well-pleaded allegations and determine, on the whole, whether Evergreen has met its heavy burden to obtain dismissal for an inconvenient forum. That is so because, in seeking to prove their case, plaintiffs will be relying on the same witnesses and documents regardless of the trial court's preliminary view of the merits of a particular allegation. A trial court must weigh the convenience and justice factors on a motion to dismiss for an inconvenient forum — which is necessarily brought at the beginning of a case — but in doing so it may not make factual determinations that go to the underlying merits of plaintiffs' claims. Cf. Munson, 264 Or.App. at 694-95, 333 P.3d 1102 (in considering a motion to dismiss, a trial court's determination of facts relevant to that consideration "may not `interfere with a party's right to a trial on disputed questions of material fact'" (quoting Black, 337 Or. at 265, 95 P.3d 1109)). Here, the trial court improperly disregarded the materiality of witnesses and evidence relevant to plaintiffs' direct-liability allegations in assessing the relative convenience of Oregon and Peru, because the court's task was to assess where that evidence would be located and its accessibility, not what that evidence might show once obtained.

The trial court also made no findings, implicit or explicit, about the availability of, or ease of access to, witnesses and documents located in Peru. A trial court cannot merely look at the location of witnesses or evidence; it must assess the availability and ease of access to material witnesses and evidence to the litigants in Oregon, which requires taking into account factors such as whether compulsory process will be required to obtain material witnesses and the relative ease of obtaining evidence given modern advances in travel, communication, and electronic discovery. Here, the trial court appears to have concluded that Peru was the convenient forum based merely on witnesses and documents being located there, without assessing whether the location of that evidence created such a burden on Evergreen that the plaintiffs' choice of Oregon as a forum is vexatious, harassing, or oppressive "by inflicting upon [Evergreen] expense or trouble not necessary to [its] own right to pursue [its] remedy." Gulf Oil, 330 U.S. at 508, 67 S.Ct. 839; see also Carijano, 643 F.3d at 1224 ("The mere fact that a case involves conduct or plaintiffs from overseas is not enough for dismissal.").

Finally, we note that the trial court also did not discuss any other factors that we now conclude it was required to consider before dismissing plaintiffs' case, nor can we discern whether the trial court gave appropriate deference to plaintiffs' choice of forum. Because the trial court did not make sufficient findings for meaningful appellate review under the standards that we have announced today, we conclude that it is appropriate to vacate the trial court's dismissal order and the general judgment and remand this case to the trial court to reconsider its decision in light of this opinion. Vacated and remanded.