In this appeal we decide that, before a judge may extend up to six months a dispositional order with an out-of-*56home placement arising from an adjudication that a child is in need of services, G. L. c. 119, § 39G, third par., requires the judge to hold an evidentiary hearing and find by a preponderance of the evidence that the purposes of the dispositional order have not been accomplished and that an extension of the order would be reasonably likely to further those purposes.1
These proceedings began on November 20, 2002, when a school official from the town of Mashpee filed a petition in the Juvenile Court alleging that an eleven year old girl, whom we shall call Angela, was a child in need of services (CHINS) by reason of truancy. See G. L. c. 119, § 39E, third par. Represented by counsel, Angela waived her right to trial by jury in the first instance, see G. L. c. 119, § 39E, ninth par., and on January 3, 2003, admitted to sufficient facts to being truant. She was adjudicated a CHINS, and she waived her right to appeal for a trial de nova before a jury of six. See G. L. c. 119, § 39E, ninth par.; G. L. c. 119, § 391. Disposition was continued to January 31, 2003, pending the report of the Juvenile Court clinic.
In the interim the judge ordered Angela be placed in (continued) custody of her mother, on condition that Angela attend school punctually and cooperate with agents of the Department of Social Services (department). See Matter of Vincent, 408 Mass. 527, 530-532 (1990) (judge may not directly order school attendance in CHINS case, but may order school attendance as condition of custody). The court clinic evaluation indicated that Angela refused to meet with the court clinician and that her mother had limited insight into Angela’s problems. On January 31, 2003, the judge made a dispositional order of commitment to the department with a provision that Angela be placed outside the home.2 See G. L. c. 119, § 39G, first par. (c). *57Neither the adjudication nor the original dispositional order was appealed.
In the twelve months that followed, the proceedings were complicated by Angela’s persistent refusal to attend school, her refusal to participate in testing, and her hospitalization for depression. She was twice “readjudicated” a CHINS and remained in the custody of the department. Because no appeal was taken from those “readjudications,” further details are not useful.
On February 13, 2004, Angela was again “readjudicated” a CHINS. That order is the subject of this appeal. No school official was present and prepared to prosecute the case. A representative of the department was present. Counsel for Angela requested the matter be dismissed for failure to prosecute. He requested, in the alternative, that an evidentiary hearing be held on the question whether Angela “continues to be a child in need of services” and that the judge make findings of fact on that issue. The matter was not dismissed, and there was no evidentiary hearing. No exhibits were received. The representative from the department reported, without being sworn, that Angela was in a foster home, was attending school in a different school district, and was doing everything asked of her. The department representative recommended keeping the current custody arrangement in place. The judge determined that the hearing was dispositional in nature, and although Angela had made significant improvement, past experience “remained relevant,” and he wanted to ensure she would complete the current school year. The judge concluded that “the purposes of the [original] order had not yet been accomplished, and that continued placement — with its attendant school success — was reasonable.” The judge “readjudicated” Angela a CHINS and extended for another six months the order placing custody of Angela with the department.* *3
*58Angela appealed, and we granted her application for direct appellate review.
Discussion. Angela argues that the “readjudication” hearing contemplated by the statute is a jury trial, and that the petitioner must prove beyond a reasonable doubt that the child continues to be in need of services. “The general and familiar rule is that a statute must be interpreted according to the intent of the Legislature ascertained from all its words construed by the ordinary and approved usage of the language, considered in connection with the cause of its enactment, the mischief or imperfection to be remedied and the main object to be accomplished, to the end that the purpose of its framers may be effectuated.” Hanlon v. Rollins, 286 Mass. 444, 447 (1934). We first address the scope of hearing that is involved.
1. Scope of hearing. General Laws c. 119, § 39G, first par., provides for a “hearing to determine whether a child is in need of services [CHINS].” General Laws c. 119, § 21, defines a CHINS as “a child below the age of seventeen who persistently runs away from the home of his parents or legal guardian, or persistently refuses to obey the lawful and reasonable commands of his parents or legal guardian, thereby resulting in said parent’s or guardian’s inability to adequately care for and protect said child, or a child between the ages of six and sixteen who persistently and wilfully fails to attend school or persistently violates the lawful and reasonable regulations of his school.” Section 39G, first par., requires an adjudication of CHINS be made by proof beyond a reasonable doubt. If a child is adjudicated a CHINS, G. L. c. 119, § 391, affords a jury trial de nova.
Section 39G, first par., specifies the types of dispositional *59orders that a judge may make following a CHINS adjudication. The dispositional order is a determination that is made separate and apart from the CHINS adjudication. See R.L. Ireland, Juvenile Law § 154 (1993 & Supp. 2004). Specifically, if the child requests a jury trial under § 391, the jury make the adjudication of CHINS, but the judge makes the dispositional order.
Section 39G, third par., which is at issue in this appeal, states:
“Any order of disposition pursuant to this section shall continue in force for not more than six months; provided, however, that the court which entered the order may, after a hearing, extend its duration for additional periods, each such period not to exceed six months if the court finds that the purposes of the order have not been accomplished and that such extension would be reasonably likely to further those purposes.”
Section 39G, third par., does not require any periodic “readjudication” of the child’s status as a CHINS. The statute does not use the words “redetermination” or “readjudication.” It merely provides for a hearing prior to an extension of the order of disposition. The statute limits the scope of the hearing under § 39G, third par., to whether the purposes of the dispositional order “have not been accomplished” and whether an “extension would be reasonably likely to further those purposes” (emphasis added). The purposes of the dispositional order include “(a) preventing delinquency involvement; (b) fostering the pursuit of education; and (c) providing support to families during periods of emotional turbulence.” R.L. Ireland, Juvenile Law, supra at § 145. Whether the purposes of the dispositional order have not been accomplished is not determined by the misconduct that gave rise to the CHINS petition, but by the needs of the child.
This procedure is in sharp contrast with other statutes that specifically provide for periodic redetermination or readjudication of the underlying basis for continued commitment. See, e.g., Wyatt, petitioner, 428 Mass. 347, 354-355 (1998) (petition under G. L. c. 123A, § 9, to determine if person remains sexually dangerous); Thompson v. Commonwealth, 386 Mass. 811, *60814 (1982) (petition for recommitment of mentally ill and dangerous persons under G. L. c. 123, §§ 8 [d], 15 [e]); Custody of a Minor (No. 1), 13 Mass. App. Ct. 66 (1982) (“redetermination” under G. L. c. 119, § 26, of child’s current needs in care and protection proceeding). Unlike most other commitment proceedings, where the person is committed to the care of an agency or a department of the State that then determines the treatment the person will receive and the basis for continued commitment is revisited periodically, the Juvenile Court retains control over the treatment of the child who is adjudicated a CHINS and the dispositional order is revisited periodically. The plain language of § 39G, third par., does not require a readjudication of a child’s status as a CHINS, that is, whether the child continues to be a runaway, a stubborn child, or a truant. It requires an inquiry into whether the purposes of the dispositional order have not been accomplished and whether an extension of the order reasonably can further those purposes.
Although § 39G, third par., speaks only of the power to extend the dispositional order, it requires the judge to look to whether the purposes of the dispositional order have been accomplished when making the determination to extend the order. Implicit in this procedure is the power to modify the original dispositional order and any subsequent dispositional order. Section 39G, third par., speaks of extending “[a]ny order of disposition,” which necessarily includes dispositional orders made after the original order, and not just the original order. This implies that dispositional orders made after the original order may be different from the original order. If they are different, it is because they have been, and therefore may be, modified.
The power to modify dispositional orders is also intuitively necessary, and derives from the needs of a CHINS. Once a child has been adjudicated a CHINS, the focus of judicial inquiry is to identify the services needed by the child. Those services may have no apparent relation to the misconduct that gave rise to the CHINS petition, namely, running away, being a stubborn child, or being truant. The misconduct that was alleged in the CHINS petition often is just one symptom of a complex set of problems. For example, a child may have been truant because she has been staying home to care for a sibling or a *61parent who is ill, or because of verbal abuse heaped on her by her peers. Even if a judge could order the child to attend school, and he may not,4 that might solve the problem of truancy, but it does not address the underlying cause of the truancy or the needs of the child. There may be other causes or needs that are not immediately apparent at the time the dispositional order enters. Or, as is often the case, a child’s needs may change, making it necessary to modify the dispositional order in order to accomplish its purposes. When deciding whether a dispositional order may be extended and modified, the judge necessarily must consider the complex question of the needs of the child and whether an extended, and in some cases, modified, order is necessary to meet those needs.
2. Type of hearing. The next issue involves the type of hearing that is required. Angela contends that the statute requires a jury trial, or at least an evidentiary hearing. The statute and its legislative history are silent on the issue. As previously noted, the statute provides for a jury trial at the adjudicatory stage of the proceedings, but no such provision is made for dispositional orders or their extension. When an extension of the dispositional order is sought, the statute calls for a hearing, and it calls on the judge to make findings. “ ‘Finding’ is a word which imports the ascertainment of a fact in a judicial proceeding, and commonly is applied to the result reached by a judge. Sometimes, however, as a matter of interpretation it has been treated as a ruling of law” (citation omitted). Garden Cemetery Corp. v. Baker, 218 Mass. 339, 346 (1914). The findings called for by the statute necessarily will require a determination of a child’s behavior in response to services offered, and perhaps a determination of the efficacy of both the provider and the services in question. Those are questions of fact. However, the existence of a factual question alone does not compel the conclusion that an evidentiary hearing is required.
We have recognized CHINS proceedings as intrusions on a child’s fundamental liberty interest in the parent-child relationship that has due process implications. See Matter of Gail, 417 *62Mass. 321, 327 (1994). See also Santosky v. Kramer, 455 U.S. 745, 753 (1982) (parents have fundamental liberty interest in care, custody, and management of their child). The fundamental requirement of due process is notice and the opportunity to be heard “at a meaningful time and in a meaningful manner.” Armstrong v. Manzo, 380 U.S. 545, 552 (1965). However, “due process is flexible and calls for such procedural protections as the particular situation demands.” Morrissey v. Brewer, 408 U.S. 471, 481 (1972). “[T]he specific dictates of due process generally requireQ consideration of three distinct factors: First, the private interest that will be affected by the official action; second, the risk of an erroneous deprivation of such interest through the procedures used, and the probable value, if any, of additional or substitute procedural safeguards; and finally, the government’s interest, including the function involved and the fiscal and administrative burdens that the additional or substitute procedural requirement would entail.” Mathews v. Eldridge, 424 U.S. 319, 335 (1976). See Care & Protection of Robert, 408 Mass. 52, 59 (1990) (applying Mathews factors to care and protection proceedings).
The first of the Mathews factors, the nature of the private interest, weighs heavily in favor of Angela. Not all CHINS cases involve an out-of-home placement or commitment to the department. Where, as here, Angela was committed to the department and the judge ordered that she be placed outside the home, the intrusion on Angela’s fundamental liberty interest, albeit temporary, was, and remains, substantial.5 See Matter of Gail, supra at 327-328 (placing custody of CHINS in department impacts fundamental liberty interest). Living apart from a parent for six months is a significant portion of one’s childhood. Although the out-of-home placement is not permanent, the time away from one’s parent cannot be recovered.
*63Second, the risk of an erroneous deprivation is palpable. Here, the judge continued the out-of-home placement to ensure that Angela would complete the school year. The department representative reported that Angela was doing well in all respects and that Angela’s mother had made arrangements for Angela to remain at her current out-of-district school for the rest of the year. However, the representative of the department said, “The current plan would be to maintain [Angela] where she is.” The department representative expressed a preference for “the stability [of] the whole set up right now,” which included placement in a foster home. Angela was not allowed to challenge the basis or soundness of the department assessment that led to the judge’s finding that the dispositional order had not been accomplished, or to present any evidence to suggest that it had. An evidentiary hearing could have exposed the facts on which the department representative recommended an extension of the dispositional order and the out-of-home placement, that is, the facts on which the judge could find that the purposes of the dispositional order had not been accomplished. Although the judge properly considered findings from earlier stages of the proceedings, cf. Custody of a Minor (No. 2), 22 Mass. App. Ct. 91, 94 (1986) (in “undertaking a § 26 review it is appropriate for the judge to apply all that has been learned since the previous hearing”), the statements made by the department representative at the extension hearing indicated a major altitudinal and behavioral turnaround by Angela that suggested the purposes of the dispositional order had in fact been accomplished.6 The failure to conduct an evidentiary hearing created a high risk that an incorrect decision would be made, especially where the statute favors a single six-month order and requires a showing that the purposes of the dispositional order have not been accomplished before the order may be extended.
The third factor, the governmental interest involved, is also substantial: protecting the welfare of children. Matter of Gail, supra at 327. In the context of a CHINS petition based on truancy, the State has an interest in “assisting] and encourag*64[ing] the use by any family of all available resources to this end.” G. L. c. 119, § 1. However, the burdens of an evidentiary hearing are minimal in this type of proceeding, and the Commonwealth, in addition to the child, would benefit from a decision that is more likely to be informed and nonerroneous.
We recognize that “many matters can lawfully — and satisfactorily — be heard on the papers,” Demoulas v. Demoulas, 428 Mass. 555, 589 (1998), quoting Equal Employment Opportunity Comm’n v. Steamship Clerks Union, Local 1066, 48 F. 3d 594, 608 (1st Cir.), cert. denied, 516 U.S. 814 (1995), and many extension hearings in CHINS cases, of which there are many types (parents may be petitioners), can be resolved acceptably without an evidentiary hearing, on the papers. However, where the requested extension involves the continuation of an out-of-home placement or a continued commitment to the department, the risk of making an erroneous decision that affects a fundamental liberty interest, without affording the child an evidentiary hearing, is unacceptable.
3. Burden of proof. Finally, we turn to the question of the burden of proof, which Angela contends should be the beyond a reasonable doubt standard, and should be borne by the petitioner. The statute requires proof beyond a reasonable doubt as to an adjudication of CHINS, but it is silent as to the burden of proof regarding dispositional orders and extensions of such orders. G. L. c. 119, § 39G. It also is silent regarding who bears the burden of proof. The legislative history sheds no light on the question.
There can be no doubt that the CHINS petitioner bears the burden of proof at the original dispositional hearing. We also think that the plain language of the statute implies that the petitioner also has the burden of proof at the extension hearing. Because the focus of the extension hearing is whether the purposes of the dispositional order have not been accomplished and whether an extension of the order would be reasonably likely to further those purposes, it makes no sense to place the burden on the child. From an adversary perspective, the child is trying to extinguish the order, not extend it, by arguing that the purposes of the dispositional order have been accomplished.
“When making the determination as to what standard of *65proof is appropriate in a particular context . . . [we utilize] the due process analysis contained in Mathews v. Eldridge,” supra. Care & Protection of Robert, supra at 58. Much, of what we have said with respect to the need for an evidentiary hearing also applies to the question of the burden of proof. However, we emphasize that although serious, the impact on the child’s fundamental right is not permanent. See id. at 67-68 (fair preponderance of the evidence standard, not clear and convincing evidence, applies to seventy-two-hour hearing in care and protection proceedings). Moreover, the use of an evidentiary hearing in cases involving out-of-home placements and observance of the legislative preference for a single six-month order should adequately reduce the risk of an erroneous decision. These observations, together with the fact that the inquiry at the extension hearing concerns satisfaction of the court’s order, suggest that the proceedings are somewhat analogous to a violation of probation hearing, at which the burden of proof is a preponderance of the evidence. See Commonwealth v. Holmgren, 421 Mass. 224, 226 (1995).
Similarities to probation violation proceedings are numerous. Although CHINS proceedings “shall not be deemed criminal,” G. L. c. 119, § 39E, their origins lie in the criminal law, see R.L. Ireland, Juvenile Law § 142 (1993 & Supp. 2004), and the proceedings retain many features of criminal trials. Both a CHINS proceeding and a criminal trial implicate fundamental liberty interests. A CHINS adjudication and a criminal conviction both require proof beyond a reasonable doubt, the former by statute, the latter by constitutional requirement. Both proceedings are concerned initially with “wrongful” conduct, although a CHINS no longer may be institutionalized. See Commonwealth v. Florence F., 429 Mass. 523, 526 (1999). Like conditions of probation, a dispositional order is designed to prevent future misconduct by requiring remedial services and other conditions on the child’s custody arrangements. Hearings to extend dispositional orders in CHINS cases and violation of probation proceedings in criminal cases both are concerned with compliance with a judge’s order, the former by statute (§ 39G), the latter by agreement. Commonwealth v. Holmgren, supra at 227. The terms and conditions of a dispositional order, like the *66terms and conditions of probation, may be modified. See Buckley v. Quincy Div. of the Dist. Court Dep’t, 395 Mass. 815, 817-818 (1985). For these reasons we conclude that the fair preponderance of the evidence standard is consistent with the requirements of due process for extension hearings in CHINS cases.
We end with a practical consideration. The hearing in this case proceeded without a petitioner. The original petitioner, a Mashpee school attendance officer, was no longer involved because Angela had been placed in a foster home outside the school district. Someone readily identifiable must be available to assume the burden of proof. Because the scope of the hearing concerns compliance with a court order, much like a probation violation proceeding, and because probation officers are involved in CHINS proceedings and are familiar with court procedures generally and probation violation proceedings specifically, we think it is appropriate for a probation officer to have primary, but not necessarily exclusive, responsibility for prosecuting a request for an extension of the dispositional order. The judge has discretion to allow someone else to prosecute the matter, such as a department attorney.7
The order extending the dispositional order is hereby vacated, and the case is remanded to the Juvenile Court for further proceedings consistent with this opinion.
So ordered.
We acknowledge the amicus briefs filed by the Juvenile Court Department of the Trial Court and the Committee for Public Counsel Services, the National Association of Counsel for Children, and the Children’s Law Center of Massachusetts.
We do not know the precise terms of the original dispositional order, which has not been included in the record. A dispositional order for commitment to the Department of Social Services (department), with or without an order for out-of-home placement, requires written certification and findings *57that “the continuation of the child in [her] home is contrary to [her] best interests and . . . [that] the department. . . has made reasonable efforts . . . to prevent or eliminate the need for removal from the home.” G. L. c. 119, § 29C, first and fourth pars.
On February 13, 2004, the judge did not make the additional findings required by G. L. c. 119, § 29C, first par., to be made annually in certain *58cases. That is, the judge should have “determine[d] . . . whether [the department] has made reasonable efforts to make it possible for the child to return safely to [her] parent.” Angela has not raised the issue of this omission, the effect of which is not clear in any event, where the statute indicates that even if the judge made a finding contrary to what is required by § 29C, first par., such a finding would “not preclude . . . any appropriate order conducive to the child’s best interest.” G. L. c. 119, § 29C, fourth par. In addition, 110 Code Mass. Regs. §§ 4.65, 6.00-6.12 (2001), require that the department complete a service plan for a CHINS committed to the department at the time of the original commitment and every six months thereafter. The record does not reflect whether this was done.
A judge may not, in a CHINS proceeding, directly order a child to attend school. See Commonwealth v. Florence F., 429 Mass. 523, 524 (1999); Matter of Vincent, 408 Mass. 527, 531 (1990).
Angela dedicated a portion of her brief to the due process rights of her mother. Because the mother has not appealed the extension order (she was summonsed at the commencement of these proceedings, but has been unrepresented throughout), we do not consider those claims. We note that, although there is no provision in the statute for appointment of counsel for a parent in CHINS cases, judges appoint counsel for parents in a CHINS case at least when custody becomes an issue. See Matter of Gail, 417 Mass. 321, 322 (1994).
es stated in note 3, supra, the judge should have “determine[d] . . . whether [the department] has made reasonable efforts to make it possible for the child to return safely to [her] parent.” G. L. c. 119, § 29C, first par.
Although a department attorney may not be required to prosecute a case if the department is not a party and is otherwise not required to provide legal services, cf. Charrier v. Charrier, 416 Mass. 105, 110 (1993), the department may agree to do so where it is providing services. See 110 Code Mass. Regs. § 4.67 (1993).