LOHR, Justice.
In a dissolution of marriage proceeding, the district court refused to enforce the property division provisions of an agreement between the petitioner (husband) and the respondent (wife) that previously had been incorporated into the decree of dissolution. Acting on an oral request by the wife at a hearing on the husband's motion in aid of execution of the decree, the court declined to enforce the agreement and instead divided the property in a manner it determined independently to be fair and equitable. The husband failed in his efforts to perfect an appeal from the trial court's judgment. Thereafter, he filed a motion under C.R.C.P. 60(b)(8) to set the judgment aside for want of jurisdiction. The trial court denied the motion, and the Colorado Court of Appeals affirmed that denial. We granted certiorari to review the jurisdiction issue and now affirm the decision of the court of appeals.
On March 14, 1977, the district court entered a decree of dissolution of marriage, which contained a finding that an agreement between the parties concerning disposition of their property was not unconscionable, and which incorporated that agreement into the decree. See section 14-10-1124), C.R.S.1978. The agreement included a procedure for the selection of appraisers who would determine the fair market value of the property each party owned on the date of the marriage and the fair market value of all assets "currently owned by either party or jointly as of December 81, 1976." The parties then were to divide the property "on the same ratio as the value of their respective properties as of the date of marriage."
In attempting to implement the agreement, various disputes arose between the parties.1 On June 28, 1978, a hearing was held and evidence was taken on the issues in controversy. During the course of the [170]*170hearing, the wife orally moved 2 that the property disposition agreement incorporated in the decree be set aside and that the court divide the property without reference to the agreement. In its judgment and decree signed June 26, 1978, the trial court found "that the agreement between the parties, dated March 12, 1977, cannot be fairly or equitably implemented because making findings of fact upon the evidence presented would necessarily result from speculation and conjecture thereby creating a probability of unconscionable or unequita-ble (sic) results ...." The district court then divided the property in a different manner than that specified in the parties' agreement.
The husband's appeal to the court of appeals was dismissed on October 23, 1978, on the ground that his motion for a new trial under C.R.C.P. 59(a) was defective. On November 14, 1978, the husband filed a motion with the district court under C.R.C.P. 60(b)(3) 3 to have that court's judgment of June 26, 1978, set aside. The motion was based on the contention that the court lacked jurisdiction to overturn the property agreement incorporated in the decree of dissolution. After a hearing on the matter, the district court denied the motion.4
On appeal, the court of appeals held that, although the district court's order may have been improper and therefore voidable, it was within the court's subject matter jurisdiction and thus not subject to attack under C.R.C.P. 60(b)(3).5 We agree with the court of appeals' decision.
I.
There is no question but that in Colorado, as elsewhere, a judgment rendered without jurisdiction is void and may be attacked directly or collaterally. Whitten v. Coit, 153 Colo. 157, 385 P.2d 131 (1963); see McLeod v. Provident Mutual Life Insurance Co., 186 Colo. 234, 526 P.2d 1318 (1974); see generally 1 A. Freeman, Law of Judgments § 333 (1925). The court must have jurisdiction over the parties and the subject matter of the issue to be decided if its judgment is to be valid. Id. The husband does not contend that he was not properly before the court for purposes of the June 26, 1978, judgment. Rather, he asserts that the district court did not have subject matter jurisdiction to deny effect to the property division agreement incorporated in the March 14, 1977, decree of dissolution. We disagree with this contention.
Subject matter jurisdiction concerns the court's authority to deal with the class of cases in which it renders judgment. See 1 A. Freeman, supra at § 337; 7 Moore, Federal Practice ¶ 60.25(2]; see generally, McLeod v. Provident Mutual Life Insurance [171]*171Co., supra. Therefore, in determining whether the court has such jurisdiction, reference must be made to the nature of the claim and the relief sought. The instant case concerns the modification of the property division terms of an agreement incorporated into a decree of dissolution under section 14-10-112(4)(a), C.R.S.1978. Unquestionably, the district court had subject matter jurisdiction to determine whether the parties' agreement regarding disposition of their property was unconscionable and, upon finding it to be not unconscionable, to set forth in the decree the terms of the agreement. See section 14-10-112(2), (4), C.R.S.1973. The husband argues, however, that once the agreement was incorporated into the decree the court lost jurisdiction to revoke or modify its provisions. See Burleson v. District Court, 196 Colo. 455, 586 P.2d 665 (1978); Lay v. Lay, 162 Colo. 43, 425 P.2d 704 (1967); Magarrell v. Magarrell, 144 Colo. 228, 355 P.2d 946 (1960). This argument ignores the fact that there are statutorily defined circumstances in which a district court may revoke or modify the property division provisions of its decree of dissolution.
Section 14-10-122(1), C.R.S.1978, states that "[the provisions [of a decree} as to property disposition may not be revoked or modified unless the court finds the existence of conditions that justify the reopening of a judgment" (emphasis added). See C.RC.P. 60(b). Because the parties' agreement has been incorporated into the decree of dissolution, it is subject to revocation or modification to the same extent as a property division rendered solely by the court.6 Under section 14-10-122(1), therefore, the district court had subject matter jurisdiction to entertain a request to modify or revoke the property disposition provisions incorporated in the decree.
IL.
It is not sufficient that the court has, in the abstract, the authority to decide the particular class of case which is before it. The court's authority must be invoked before it can act. See 1 A. Freeman, supra, at 338. The husband argues that the procedures of C.R.C.P. 60(b) must be followed in order to invoke the court's authority to set aside a decree respecting property disposition, see In re Marriage of Gallegos, 41 Colo.App. 116, 580 P.2d 838 (1978), and that the wife's oral request to divide the property, made more than one year after the decree was entered, was neither a sufficient nor a timely motion under that rule. We disagree.
Unless due process was violated, the informality of the wife's request to set aside the property agreement amounts to no more than an irregularity not affecting the jurisdiction of the district court. See McLeod v. Provident Mutual Life Insurance Co., supra; 7
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LOHR, Justice.
In a dissolution of marriage proceeding, the district court refused to enforce the property division provisions of an agreement between the petitioner (husband) and the respondent (wife) that previously had been incorporated into the decree of dissolution. Acting on an oral request by the wife at a hearing on the husband's motion in aid of execution of the decree, the court declined to enforce the agreement and instead divided the property in a manner it determined independently to be fair and equitable. The husband failed in his efforts to perfect an appeal from the trial court's judgment. Thereafter, he filed a motion under C.R.C.P. 60(b)(8) to set the judgment aside for want of jurisdiction. The trial court denied the motion, and the Colorado Court of Appeals affirmed that denial. We granted certiorari to review the jurisdiction issue and now affirm the decision of the court of appeals.
On March 14, 1977, the district court entered a decree of dissolution of marriage, which contained a finding that an agreement between the parties concerning disposition of their property was not unconscionable, and which incorporated that agreement into the decree. See section 14-10-1124), C.R.S.1978. The agreement included a procedure for the selection of appraisers who would determine the fair market value of the property each party owned on the date of the marriage and the fair market value of all assets "currently owned by either party or jointly as of December 81, 1976." The parties then were to divide the property "on the same ratio as the value of their respective properties as of the date of marriage."
In attempting to implement the agreement, various disputes arose between the parties.1 On June 28, 1978, a hearing was held and evidence was taken on the issues in controversy. During the course of the [170]*170hearing, the wife orally moved 2 that the property disposition agreement incorporated in the decree be set aside and that the court divide the property without reference to the agreement. In its judgment and decree signed June 26, 1978, the trial court found "that the agreement between the parties, dated March 12, 1977, cannot be fairly or equitably implemented because making findings of fact upon the evidence presented would necessarily result from speculation and conjecture thereby creating a probability of unconscionable or unequita-ble (sic) results ...." The district court then divided the property in a different manner than that specified in the parties' agreement.
The husband's appeal to the court of appeals was dismissed on October 23, 1978, on the ground that his motion for a new trial under C.R.C.P. 59(a) was defective. On November 14, 1978, the husband filed a motion with the district court under C.R.C.P. 60(b)(3) 3 to have that court's judgment of June 26, 1978, set aside. The motion was based on the contention that the court lacked jurisdiction to overturn the property agreement incorporated in the decree of dissolution. After a hearing on the matter, the district court denied the motion.4
On appeal, the court of appeals held that, although the district court's order may have been improper and therefore voidable, it was within the court's subject matter jurisdiction and thus not subject to attack under C.R.C.P. 60(b)(3).5 We agree with the court of appeals' decision.
I.
There is no question but that in Colorado, as elsewhere, a judgment rendered without jurisdiction is void and may be attacked directly or collaterally. Whitten v. Coit, 153 Colo. 157, 385 P.2d 131 (1963); see McLeod v. Provident Mutual Life Insurance Co., 186 Colo. 234, 526 P.2d 1318 (1974); see generally 1 A. Freeman, Law of Judgments § 333 (1925). The court must have jurisdiction over the parties and the subject matter of the issue to be decided if its judgment is to be valid. Id. The husband does not contend that he was not properly before the court for purposes of the June 26, 1978, judgment. Rather, he asserts that the district court did not have subject matter jurisdiction to deny effect to the property division agreement incorporated in the March 14, 1977, decree of dissolution. We disagree with this contention.
Subject matter jurisdiction concerns the court's authority to deal with the class of cases in which it renders judgment. See 1 A. Freeman, supra at § 337; 7 Moore, Federal Practice ¶ 60.25(2]; see generally, McLeod v. Provident Mutual Life Insurance [171]*171Co., supra. Therefore, in determining whether the court has such jurisdiction, reference must be made to the nature of the claim and the relief sought. The instant case concerns the modification of the property division terms of an agreement incorporated into a decree of dissolution under section 14-10-112(4)(a), C.R.S.1978. Unquestionably, the district court had subject matter jurisdiction to determine whether the parties' agreement regarding disposition of their property was unconscionable and, upon finding it to be not unconscionable, to set forth in the decree the terms of the agreement. See section 14-10-112(2), (4), C.R.S.1973. The husband argues, however, that once the agreement was incorporated into the decree the court lost jurisdiction to revoke or modify its provisions. See Burleson v. District Court, 196 Colo. 455, 586 P.2d 665 (1978); Lay v. Lay, 162 Colo. 43, 425 P.2d 704 (1967); Magarrell v. Magarrell, 144 Colo. 228, 355 P.2d 946 (1960). This argument ignores the fact that there are statutorily defined circumstances in which a district court may revoke or modify the property division provisions of its decree of dissolution.
Section 14-10-122(1), C.R.S.1978, states that "[the provisions [of a decree} as to property disposition may not be revoked or modified unless the court finds the existence of conditions that justify the reopening of a judgment" (emphasis added). See C.RC.P. 60(b). Because the parties' agreement has been incorporated into the decree of dissolution, it is subject to revocation or modification to the same extent as a property division rendered solely by the court.6 Under section 14-10-122(1), therefore, the district court had subject matter jurisdiction to entertain a request to modify or revoke the property disposition provisions incorporated in the decree.
IL.
It is not sufficient that the court has, in the abstract, the authority to decide the particular class of case which is before it. The court's authority must be invoked before it can act. See 1 A. Freeman, supra, at 338. The husband argues that the procedures of C.R.C.P. 60(b) must be followed in order to invoke the court's authority to set aside a decree respecting property disposition, see In re Marriage of Gallegos, 41 Colo.App. 116, 580 P.2d 838 (1978), and that the wife's oral request to divide the property, made more than one year after the decree was entered, was neither a sufficient nor a timely motion under that rule. We disagree.
Unless due process was violated, the informality of the wife's request to set aside the property agreement amounts to no more than an irregularity not affecting the jurisdiction of the district court. See McLeod v. Provident Mutual Life Insurance Co., supra; 7 Moore, Federal Practice ¶ 60.25[2]. Also, we note that the motion was made during the course of an eviden-tiary hearing on the property disposition at which both parties and their counsel were present. A motion made during a hearing need not be in writing. C.R.C.P. 7(b). The husband does not argue, and the facts before us do not indicate, that the informal motion and hearing procedures denied the husband due process of law.
Turning next to the sufficiency of the content of the wife's oral motion, we find ourselves unable to review that matter [172]*172because the motion was not made part of the record. We note, however, that it is not a prerequisite to the court's subject matter jurisdiction under C.R.C.P. 60(b) that the grounds asserted in the motion to set aside a judgment be legally adequate. Of course, if the grounds asserted and proved do not support the setting aside of a judgment under the standards specified in the rule, any order granting such relief is subject to reversal on appeal. See Cortvriendt v. Cortvriendt, 146 Colo. 387, 361 P.2d 767 (1961). Nevertheless, the failure to allege sufficient grounds for relief from a prior judgment does not make the subsequent order granting that motion void. The court's action would simply be legal error, making the order vulnerable to reversal upon appeal. See Clarke v. Asher, 53 Colo. 313, 125 P. 538 (1912) (judgment not subject to collateral attack even though the complaint on which the judgment was rendered fails to state a cause of action).
Finally, the matter of timeliness of the wife's motion does not present a jurisdictional defect. Although the six month period for motions under C.R.C.P. 60(b)(1) and (2) had passed at the time the wife made her request, see In re Marriage of Gallegos, supra, the rule provides that a motion under C.R.C.P. 60(b)(8), (4) or (5) shall be made within a reasonable time. Because the transcript of the hearing on the oral motion has not been made part of the record before us, and because reasonableness involves factual considerations, we are unable to address the husband's contention that the wife's oral motion was not made within a reasonable time. Cf. People v. Gallegos, 179 Colo. 211, 499 P.2d 315 (1972).
We conclude that the trial court had subject matter jurisdiction under CRCP. 60(b)(4) and (5) to enter its June 26, 1978, order setting aside the property disposition agreement which it previously had approved and incorporated in the decree of dissolution of marriage. Jurisdiction is the only issue before the court in a motion under C.R.C.P. 60(b)(3).8 The court of appeals was correct, therefore, in affirming the trial court's denial of the petitioner's C.RC.P. 60(b)(3) motion to set the judgment aside.
The judgment of the court of appeals is affirmed.