[117]*117DE MUNIZ, J.
These consolidated appeals, over which we have exclusive jurisdiction,1 require us to determine whether a circuit court properly vacated and remanded certain orders that the Public Employees Retirement Board (PERB) issued in 1998 and 2000.2 PERB issued two orders establishing, for the years 1998 and 2000, the amounts that public employers were required to contribute into the Public Employees Retirement Fund (the fund), and one order allocating the fund’s 1999 earnings among various accounts within the fund. The parties present several arguments pertaining to the trial court’s judgment vacating and remanding the orders. For the reasons that follow, however, we conclude that these appeals are moot, and we therefore dismiss them.
Because this case involves PERB’s administration of the Public Employees Retirement System (PERS), we explain briefly how PERS has operated and the events leading up to this litigation.
Oregon has provided its public employees with a retirement plan since 1945. Funding for the plan comes from three sources: employee (member) contributions, employer contributions, and investment earnings on those contributions. PERB administers PERS and acts as trustee for the fund. Among other things, PERB sets employer contribution rates and allocates annual earnings to employer and member accounts and to reserves.
Several employers, including the City of Eugene, timely challenged PERB orders issued in 1998 and 2000 that increased employer contribution rates, and a PERB order issued in March 2000 that credited 1999 earnings to certain [118]*118member accounts. The trial court consolidated the various challenges. The City of Eugene Water and Electric Board (EWEB) nonetheless sought independently to raise its own legal challenges to the orders. PERB moved, inter alia, for the trial corn! to dismiss E WEB’s petition for judicial review pursuant to ORCP 21 A(3).3 The trial court granted that motion. Several PERS members also intervened in the litigation both to raise their own challenge to the PERB order issued in March 2000 that credited 1999 earnings and to defend PERB’s 1998 and 2000 employer contribution rate orders.
As relevant here, employers argued that PERB (1) unlawfully had failed to fund a contingency reserve account, which caused employer contribution rates to increase; (2) unlawfully had required employers to match the earnings in members’ variable annuity accounts; (3) unlawfully had failed to adopt and implement updated actuarial factors when calculating member retirement benefits; and (4) had abused its discretion by crediting Tier One members’4 regular accounts in excess of the assumed earnings rate while failing to fund adequately the contingency reserve account, the Benefits-in-Force reserve account, and the gain-loss reserve account.
With respect to those claims, the trial court concluded that (1) PERB unlawfully had failed to maintain a contingency reserve account; (2) PERB unlawfully had required employers to match the earnings in members’ variable annuity accounts;5 (3) PERB unlawfully had failed to [119]*119adopt and implement updated actuarial factors when calculating member retirement benefits; and (4) PERB had abused its discretion by crediting Tier One members’ regular accounts with 20 percent earnings for 1999.
Intervenors’ only challenge respecting the PERB orders at issue was to PERB’s March 2000 order crediting 1999 earnings. However, their answer to employers’ complaint set out a series of affirmative defenses in support of PERB’s 1998 and 2000 employer contribution rate orders. With respect to intervenors’ challenge to the 2000 earnings allocation order, intervenors argued that PERB had credited to employer accounts some of the earnings generated by members’ variable accounts in violation of PERB’s fiduciary duties to members.6 The trial court agreed. In its ORCP 67 B judgment, the trial court concluded that, because ORS 238.250 (1999)7 required all earnings, not otherwise statutorily required to be allocated for a specific purpose, to be credited to member accounts, PERB had breached the statutory contract, and thus its fiduciary duty, when it allocated earnings on members’ variable accounts to employer accounts.
The trial court therefore vacated each of the challenged orders and remanded them to PERB with instructions that PERB issue new orders consistently with the court’s judgment. PERB, intervenors, and EWEB appealed. Additionally, PERB sought from both the trial court and, later, [120]*120the Court of Appeals, a stay of the trial court’s judgment. Both courts denied that request.
After the trial court entered its judgment and the parties had taken their appeals, the legislature passed several amendments to the statutes governing PERS that altered significantly the structure of PERS and the manner in which PERB would administer the fund in the future. As noted, the legislation provided, in part, that this court would have exclusive jurisdiction to decide these cases, and it directed the Court of Appeals to transfer them to this court.
After the Court of Appeals transferred the cases to this court, and while the cases still were pending before this court, PERB and the various employers entered into a settlement agreement in which PERB agreed to issue, by July 1, 2004, new orders that would comply with both the trial court’s judgment and the terms of the legislative amendments. More specifically, the agreement provided, in part:
“1. PERB will implement the judgment entered in City of Eugene v. State of Oregon, Public Employees Retirement Board (‘the judgment’) as follows, except in the event of a supervening change in law (such as by a legislative enactment or further court order):
“1.1. No later than July 1, 2004, PERB will adopt a rule governing the calculation of money match benefits for members participating in the variable account program that conforms to [the] July 2001 Court order in the City of Eugene. * * * PERB will apply its money match calculation rule to retirements occurring on or after the earlier of the date that the rule is adopted or July 1, 2004.
“1.2 PERB will implement the judgment upholding Intervenors’ challenge to the ‘employer-in-variable’ rule by transferring from employer accounts to the contingency reserve established by ORS 238.670(1) the amount determined by the PERS actuary to have been improperly credited to [121]*121employer accounts according to the judgment. * * *
“1.3 The new 1999 earnings allocation order described in paragraph 1.2 above will provide that the appropriate earnings allocation to Tier [One] regular member accounts is 11.33 [percent], that [seven and one half percent] of the 1999 earnings should have been allocated to the contingency reserve established by ORS 238.670
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[117]*117DE MUNIZ, J.
These consolidated appeals, over which we have exclusive jurisdiction,1 require us to determine whether a circuit court properly vacated and remanded certain orders that the Public Employees Retirement Board (PERB) issued in 1998 and 2000.2 PERB issued two orders establishing, for the years 1998 and 2000, the amounts that public employers were required to contribute into the Public Employees Retirement Fund (the fund), and one order allocating the fund’s 1999 earnings among various accounts within the fund. The parties present several arguments pertaining to the trial court’s judgment vacating and remanding the orders. For the reasons that follow, however, we conclude that these appeals are moot, and we therefore dismiss them.
Because this case involves PERB’s administration of the Public Employees Retirement System (PERS), we explain briefly how PERS has operated and the events leading up to this litigation.
Oregon has provided its public employees with a retirement plan since 1945. Funding for the plan comes from three sources: employee (member) contributions, employer contributions, and investment earnings on those contributions. PERB administers PERS and acts as trustee for the fund. Among other things, PERB sets employer contribution rates and allocates annual earnings to employer and member accounts and to reserves.
Several employers, including the City of Eugene, timely challenged PERB orders issued in 1998 and 2000 that increased employer contribution rates, and a PERB order issued in March 2000 that credited 1999 earnings to certain [118]*118member accounts. The trial court consolidated the various challenges. The City of Eugene Water and Electric Board (EWEB) nonetheless sought independently to raise its own legal challenges to the orders. PERB moved, inter alia, for the trial corn! to dismiss E WEB’s petition for judicial review pursuant to ORCP 21 A(3).3 The trial court granted that motion. Several PERS members also intervened in the litigation both to raise their own challenge to the PERB order issued in March 2000 that credited 1999 earnings and to defend PERB’s 1998 and 2000 employer contribution rate orders.
As relevant here, employers argued that PERB (1) unlawfully had failed to fund a contingency reserve account, which caused employer contribution rates to increase; (2) unlawfully had required employers to match the earnings in members’ variable annuity accounts; (3) unlawfully had failed to adopt and implement updated actuarial factors when calculating member retirement benefits; and (4) had abused its discretion by crediting Tier One members’4 regular accounts in excess of the assumed earnings rate while failing to fund adequately the contingency reserve account, the Benefits-in-Force reserve account, and the gain-loss reserve account.
With respect to those claims, the trial court concluded that (1) PERB unlawfully had failed to maintain a contingency reserve account; (2) PERB unlawfully had required employers to match the earnings in members’ variable annuity accounts;5 (3) PERB unlawfully had failed to [119]*119adopt and implement updated actuarial factors when calculating member retirement benefits; and (4) PERB had abused its discretion by crediting Tier One members’ regular accounts with 20 percent earnings for 1999.
Intervenors’ only challenge respecting the PERB orders at issue was to PERB’s March 2000 order crediting 1999 earnings. However, their answer to employers’ complaint set out a series of affirmative defenses in support of PERB’s 1998 and 2000 employer contribution rate orders. With respect to intervenors’ challenge to the 2000 earnings allocation order, intervenors argued that PERB had credited to employer accounts some of the earnings generated by members’ variable accounts in violation of PERB’s fiduciary duties to members.6 The trial court agreed. In its ORCP 67 B judgment, the trial court concluded that, because ORS 238.250 (1999)7 required all earnings, not otherwise statutorily required to be allocated for a specific purpose, to be credited to member accounts, PERB had breached the statutory contract, and thus its fiduciary duty, when it allocated earnings on members’ variable accounts to employer accounts.
The trial court therefore vacated each of the challenged orders and remanded them to PERB with instructions that PERB issue new orders consistently with the court’s judgment. PERB, intervenors, and EWEB appealed. Additionally, PERB sought from both the trial court and, later, [120]*120the Court of Appeals, a stay of the trial court’s judgment. Both courts denied that request.
After the trial court entered its judgment and the parties had taken their appeals, the legislature passed several amendments to the statutes governing PERS that altered significantly the structure of PERS and the manner in which PERB would administer the fund in the future. As noted, the legislation provided, in part, that this court would have exclusive jurisdiction to decide these cases, and it directed the Court of Appeals to transfer them to this court.
After the Court of Appeals transferred the cases to this court, and while the cases still were pending before this court, PERB and the various employers entered into a settlement agreement in which PERB agreed to issue, by July 1, 2004, new orders that would comply with both the trial court’s judgment and the terms of the legislative amendments. More specifically, the agreement provided, in part:
“1. PERB will implement the judgment entered in City of Eugene v. State of Oregon, Public Employees Retirement Board (‘the judgment’) as follows, except in the event of a supervening change in law (such as by a legislative enactment or further court order):
“1.1. No later than July 1, 2004, PERB will adopt a rule governing the calculation of money match benefits for members participating in the variable account program that conforms to [the] July 2001 Court order in the City of Eugene. * * * PERB will apply its money match calculation rule to retirements occurring on or after the earlier of the date that the rule is adopted or July 1, 2004.
“1.2 PERB will implement the judgment upholding Intervenors’ challenge to the ‘employer-in-variable’ rule by transferring from employer accounts to the contingency reserve established by ORS 238.670(1) the amount determined by the PERS actuary to have been improperly credited to [121]*121employer accounts according to the judgment. * * *
“1.3 The new 1999 earnings allocation order described in paragraph 1.2 above will provide that the appropriate earnings allocation to Tier [One] regular member accounts is 11.33 [percent], that [seven and one half percent] of the 1999 earnings should have been allocated to the contingency reserve established by ORS 238.670(1), and that the gain-loss reserve created by ORS 238.670(3) should have been funded to the full extent of the former PERB’s policy to maintain a gain-loss reserve sufficient to credit the assumed interest rate to Tier [One] regular member accounts during a period of 30 months of [zero percent] earnings.
“1.4 PERB will henceforth comply with existing statutory directives concerning reserving practices and mortality tables as interpreted in the City of Eugene judgment and as amended by the reform legislation, except to the extent that such legislation is subsequently modified or repealed, or except to the extent that PERB is ordered to do otherwise by a court of competent jurisdiction.
“1.5 PERB will direct its actuary to recalculate employer contribution rates for Petitioners * * *. The actuary will be directed to calculate those contribution rates as if PERB’s practices and actuarial assumptions with respect to employer match of variable accounts, actuarial equivalency factors, reserving practices and the ‘employer-invariable’ rule had been consistent with the law as interpreted in the judgment and as if PERB had, for 1999, originally allocated earnings of 11.33 [percent] to Tier [One] regular member accounts, allocated [seven and one half percent] of earnings to the contingency reserve and had fully funded the gain-loss reserve pursuant to its policy [122]*122described above in paragraph 1.3. PERB will issue new contribution rate orders for the City of Eugene (including EWEB) and Lane County for 1998, 2000, and 2003, and for all other Petitioners for 2000 and 2003, consistent with the actuary’s recalculations. * * *
“1.6 PERB will issue new employer contribution rate orders for all participating employers for 2003, no later than July 1, 2004, calculated to implement paragraphs 1.1,1.2,1.3 and 1.4 above.”
That agreement reflects PERB’s implementation of the trial court’s judgment, which was final until an appellate judgment issued.8 Pursuant to that agreement, PERB has issued [123]*123new employer contribution rate orders for 1998 and 2000, and a new order crediting 1999 earnings.9 PERB’s actions in entering the new orders are now the subject of other litigation that is not before this court.
After entering into that agreement, employers moved to dismiss the appeals, arguing that the settlement agreement had rendered the underlying controversy moot. PERB later joined that motion.
Intervenors and EWEB raise various challenges to the manner in which the trial court resolved several issues. Intervenors raise 11 assignments of error, all of which relate to their defense of PERB’s 1998 and 2000 employer contribution rate orders:
(1) “The trial court erred in granting petitioners’ motion for summary judgment on Count Two of the First Claim for Relief and in ruling that PERB violated ORS 238.260(12)[10] and ORS 238.300(2)(a) by requiring employers to match all earnings allocated to members’ variable annuity accounts.”
(2) “The trial court exceeded its limited jurisdiction under the Administrative Procedures Act when it declared invalid OAR 459-005-0055.”
(3) “The trial court erred in ruling that PERB applied an invalid administrative rule when it failed to update mortality tables to maintain ‘actuarial equivalency.’ ”
(4) “The trial court erred in denying intervenors’ motion to compel production of legal opinions advising PERB on PERS administration relating to actuarial factors.”
(5) “The trial court erred in granting summary judgment on the fourth claim for relief, ordering PERB to fund a contingency reserve.”
(6) “The trial court erred when it ruled that PERB abused its discretion in failing to allocate out of the 1999 earnings [124]*124an amount sufficient to meet a 30-month funding goal for the gain/loss reserve account.”
(7) “The trial court erred in ruling that PERB abused its discretion by its allocation of 1999 earnings to employee accounts.”
(8) “The trial court erred in admitting evidence of conditions which occurred after the 1998 and 2000 rate orders.”
(9) “The trial court erred in granting petitioners leave to file a third amended petition.”
(10) “The trial court erred in refusing to allow additional evidence in response to the third amended petition.”
(11) “The trial court erred in denying intervenors’ motion for new trial.”
In addition, EWEB raises the following three assignments of error, all of which are premised on whether EWEB may proceed in this litigation separately from the other employers:
(1) “The trial court erred in allowing the PERB motion to dismiss EWEB as a party pursuant to ORCP 21 A(3).”
(2) “The trial court erred in denying EWEB’s motion for partial summary judgment that the PERB had violated ORS 238.300(2)(b)(A) by distributing money match pensions to members not entitled to a pension under the original Retirement Act before its revision in 1967 and in concluding the PERB did not misinterpret the requirements of ORS 238.300(2)(b)(A) when PERB required Petitioners to match earnings on members’ regular accounts.”
(3) “The trial court erred in denying EWEB’s motion for partial summary judgment that PERB’s distribution of income in excess of the assumed interest rate violated the statutory mandates of ORS 238.670(2) and by interpreting ORS 238.670(2) to allow the PERB to exercise discretion in the distribution of earnings.”
Employers and PERB maintain their argument that, because PERB has issued new orders pursuant to the settlement agreement, and because those new orders replace the old, vacated orders, the appeals are moot. Intervenors respond that the appeals are not moot because this court could conclude that the trial court did not correctly interpret the relevant statutes, reverse the trial court’s judgment, and [125]*125“revive” the 1998 and 2000 employer contribution rate orders. We initially denied employers’ and PERB’s motions to dismiss without prejudice. After further consideration, and based on intervening events and proceedings, we agree with employers and PERB.11
We begin by noting the procedural posture of this case. The following events have occurred since the actions were filed: (1) the trial court vacated and remanded to PERB all the challenged orders, with intervenors prevailing in their challenge to the 2000 earnings allocation order; (2) PERB, intervenors, and EWEB filed appeals of the trial court’s judgment in the Court of Appeals; (3) the legislature amended, significantly, the statutes governing PERS; and (4) while the appeals were pending in this court, PERB and employers settled, agreeing to comply with the trial court’s judgment and the legislative amendments. The only “controversy” that remains, therefore, is intervenors’ continued defense of the vacated, and replaced, 1998 and 2000 employer contribution rate orders.
The end result that intervenors seek is a return to the status quo ante, with this court reversing the trial court’s judgment and, effectively, reviving the 1998 and 2000 employer contribution rate orders. However, as discussed earlier, PERB and employers’ decision to follow the terms of the settlement agreement has resulted in PERB’s issuance of new orders that have superseded the orders at issue in these appeals. Thus, even if this court concluded that the trial court erred and issued a judgment granting intervenors the relief that they seek, that judgment would not affect the new orders that PERB has issued pursuant to the settlement agreement.
Further, the 2003 legislative amendments combined with this court’s decision in Strunk v. PERB, 338 Or 145, 108 P3d 1058 (2005), resolved all but one of the substantive issues in these appeals. In Strunk, this court concluded that PERB exceeded its statutory authority when it adopted an [126]*126administrative rule providing that, with respect to certain members, it would not implement updated actuarial factors. 338 Or at 235-36. That conclusion disposes of intervenors’ challenges to the trial court’s conclusions respecting that rule. The court also concluded that certain petitioners in Strunk were not entitled to the production of documents containing legal advice that the Attorney General had given to PERB concerning actuarial factors. Id. at 156. In this court’s view, those documents were not “relevant to any claim at issue[.]” Id. The court’s disposition of that issue in Strunk applies here, and the trial court correctly denied intervenors’ motion to compel production of those documents.
In addition, in Strunk, this court observed that ORS 238.670(1) requires PERB to fond a contingency reserve:
“In years in which the earnings on the fund equal or exceed the guaranteed earnings rate, PERB statutorily is required to ‘set aside * * * such part of the income as [PERB] may deem advisable, not exceeding seven and one-half percent of the combined total of such income, which moneys so segregated shall remain in the fund and constitute therein a reserve account.’ ”
Id. at 159 n 16. Based on that observation, we conclude that intervenors’ challenge to that aspect of the trial court’s judgment effectively was resolved in Strunk.
Finally, with respect to the gain-loss reserve account, the trial court concluded specifically that “PERB abused its discretion in allocating 1999 earnings of 20 [percent] to Tier One regular employee accounts.” The court directed that, on remand, PERB was to recalculate its crediting decision to reflect an amount consistent with its 30-month funding goal12 for the gain-loss reserve account. As this court observed in Strunk regarding that judgment:
[127]*127“Pursuant to the trial court’s judgment, the Fiscal Services Division (FSD) of PERS recalculated the credits to Tier One members’ regular accounts for 1999 and concluded that, if PERB properly had funded the contingency and gain-loss reserves in 1999, the appropriate credit to members’ regular accounts for that year would have been 11.33 percent. Before FSD presented that figure to PERB for final approval, however, the legislature requested that information directly from FSD. The legislature subsequently enacted the 2003 PERS legislation. Oregon Laws 2003, chapter 67, sections 9 and 10, as amended by Oregon Laws 2003, chapter 625, section 13, effectively codifying the 11.33 percent figure as the correct 1999 crediting decision.”
338 Or at 216. The legislature also enacted Oregon Laws 2003, chapter 3, section 1, as amended by Oregon Laws 2003, chapter 67, section 5, which requires the gain-loss reserve account “to be fully funded with amounts determined by the board, after consultation with the actuary employed by the board, to be necessary to ensure a zero balance in the account when all [Tier One members] have retired [.]” That provision reflects a codification of PERB’s 30-month funding goal for the gain-loss reserve account.
It follows that the only substantive issue presented in these appeals that has not been resolved by the intervening legislative amendments to PERS or by this court’s decision in Strunk is whether the trial court erred when it agreed with employers that PERB unlawfully had required employers to match the earnings on members’ variable accounts.13 However, PERB and employers resolved that issue in the settlement agreement discussed earlier. Specifically, they agreed that PERB would make statutorily required adjustments to all service retirement allowances that would not cause employers to match earnings on variable accounts. As noted, PERB also has issued new employer contribution rate [128]*128orders pursuant to that agreement. Because PERB and employers have resolved the issue and PERB has issued new orders, we no longer are required to resolve that issue in these appeals.
Based on the foregoing, we conclude that these appeals are moot. The settlement agreement and the new orders that PERB has issued have removed any practical effect that a decision on the merits from this court could have on the rights of the parties. See, e.g., Edmunson v. Dept. of Ins. and Finance, 314 Or 291, 838 P2d 589 (1992) (concluding that challenge to superseded rules was moot, because new rule reflected present law). It follows that the case should be dismissed. See Yancy v. Shatzer, 337 Or 345, 97 P3d 1161 (2004) (moot case not justiciable); Hamel v. Johnson, 330 Or 180, 184, 998 P2d 661 (2000) (case is moot and must be dismissed if impossible for court to grant “effectual relief’); Brumnett v. PSRB, 315 Or 402, 405, 848 P2d 1194 (1993) (cases in which court’s decision no longer will have practical effect on rights of parties will be dismissed as moot).
The appeals are dismissed as moot.