
406 Mass. 337 (1989)
547 N.E.2d 927
PHYLLIS ANDRADE & others[1]
vs.
CITY COUNCIL OF GLOUCESTER & others[2].
Supreme Judicial Court of Massachusetts, Essex.
November 9, 1989.
December 18, 1989.
Present: LIACOS, C.J., WILKINS, ABRAMS, O'CONNOR, & GREANEY, JJ.
Christopher M. Welch for the plaintiffs.
Linda Thomas Lowe, City Solicitor, for the defendants.
*338 Gary S. Brackett & Arthur J. Goldberg, for City Solicitors & Town Counsel Association, amicus curiae, submitted a brief.
GREANEY, J.
The dispute in this case centers on a vote taken by the city council of Gloucester (city council) on September 27, 1988, which determined the percentages of the local tax levy to be borne by the various classes of real and personal property in the city. This determination of the tax factor was made pursuant to the statutory procedure governing the administration of local property taxes. G.L.c. 40, § 56 (1988 ed.) ("the city council ... in each city ... shall annually first determine the percentages of the local tax levy to be borne by each class of real property ... and personal property for the next fiscal year"). The plaintiffs, a group of Gloucester residents, challenged the September 27 vote by a referendum petition bearing the signatures of the requisite number of Gloucester registered voters. The Gloucester registrar of voters certified the signatures on October 21, 1988. On November 3, 1988, the city council decided, on the advice of legal counsel, that the vote of September 27 was not subject to referendum. The city council also voted not to rescind the earlier vote.
The plaintiffs commenced an action in the Superior Court on February 2, 1989, seeking declaratory and other relief to the effect that the September 27 vote constituted a "measure" subject to referendum under § 9-3 of the Gloucester city charter and the provisions of G.L.c. 43, § 42 (1988 ed.). The parties prepared a statement of agreed facts (the essential parts of which are set forth above), and a judge in the Superior Court reported the case to the Appeals Court. We granted the plaintiffs' application for direct appellate review. We conclude that the issue presented has become moot. However, because the issue is important, and might recur, we exercise our discretion to express our views on the issue.[3]
*339 1. The tax bills for fiscal year 1989 have been sent out and the taxes collected by the city. The current fiscal year's tax classification vote has been taken by the city council, and it has not been made the subject of challenge by referendum petition. There appears to be no present controversy before the court. See Brown v. City Council of Cambridge, 289 Mass. 333, 334 (1935).
However, the question raised is one of public importance not only to Gloucester but also to other municipalities. There is a likelihood that the controversy could recur by a challenge to a future vote setting the tax factor. In view of the time needed to complete preparation of the case in the trial court, there is a good chance that the question, once raised, could evade judicial review. We conclude that the uncertainty presented by the issue should be settled and, therefore, we shall state our views despite the mootness of the case. See Karchmar v. Worcester, 364 Mass. 124, 136 (1973).
2. Section 42 of c. 43 of the General Laws provides that "the final passage of any measure" (except a revenue loan order) by a city council or a school committee may be presented for voter approval in a referendum petition.[4] For purposes of this case, we assume that the plaintiffs have essentially complied with the requirements of the statutory procedure for preparing a referendum petition notwithstanding some discrepancies in the form of their documents. See Lafleur v. Chicopee, 352 Mass. 746, 753 (1967). Thus, if the *340 September 27 vote constituted "the final passage of any measure," the plaintiffs would have been entitled to have their referendum petition placed on the ballot for consideration by the voters of Gloucester.
The term "measure" is defined as "an ordinance, resolution, order or vote passed by a city council." G.L.c. 43, § 37 (1988 ed.).[5] In construing the term in previous cases, we have considered instructive the distinction between legislative and executive acts, reasoning that only the former constitute "measure[s]" subject to referendum petition. See, e.g., Gould v. City Council of Newburyport, 392 Mass. 302 (1984); Moore v. School Comm. of Newton, 375 Mass. 443 (1978); Fantini v. School Comm. of Cambridge, 362 Mass. 320 (1972); Gorman v. Peabody, 312 Mass. 560 (1942); Dooling v. City Council of Fitchburg, 242 Mass. 599 (1922). See also 5 E. McQuillin, Municipal Corporations § 16.55, at 265 (3d ed. rev. 1989) (noting that the referendum power is generally restricted to legislative acts).
In applying the legislative-executive test, we have noted that the crucial inquiry is "whether the proposition is one to make new law or to execute law already in existence." Moore v. School Comm. of Newton, supra at 447, quoting 5 E. McQuillin, supra at § 16.55, at 266. See Dooling v. City Council of Fitchburg, supra at 601-602 (defining a legislative act as "the laying down of a rule, a principle or a law by which the conduct of a public officer may be guided"). We are satisfied that the September 27 vote setting the tax factor was an executive act.
The authority to establish the residential tax factor under G.L.c. 40, § 56, has been conferred by the Legislature on boards of selectmen in towns and on city councils, "together with the ... approval" of mayors, in cities. The board of selectmen, in many municipalities, constitutes the chief executive office of a town, and the board's vote is not subject under the statute to the approval of the town meeting. Thus, *341 in many of the Commonwealth's municipalities, the decision as to the tax factor is made solely by the executive body. Prior to 1982, in cities, the primary determination of the tax factor was made by the board of assessors or by the mayor subject to approval by the city council. This decision was clearly an executive act. Since 1982, the tax factor in cities is determined by the city council with the mayor's approval. The primary authority in the area, which has also been considered executive in nature, was thus transferred from the assessors or mayor to the city council. We doubt that the Legislature would want the tax factor decision considered as different in substance depending on whether the decision is made in a town or a city.
The statutory process also makes it clear that several municipal officers and boards, as well as State officers, are intimately involved in the complex process of setting the tax rate. The board of assessors is required to furnish information to the Commissioner of Revenue so that he can: (a) certify that the board is assessing property at full and fair cash value; and (b) determine a minimum residential tax factor pursuant to G.L.c. 58, § 1A (1988 ed.). The board of assessors must also provide information to the board of selectmen or to the city council and mayor, as well as to the general public, so that an intelligent decision can be made on the residential tax factor and the percentage of the levy to be borne by each class of property. See G.L.c. 40, § 56. The Commissioner of Revenue then must give final approval to the tax rate, which, once approved and returned to the assessors, cannot be changed. See G.L.c. 59, § 23 (1988 ed.). This process suggests that the various officials involved are engaged in implementation of the laws which establish the intricate process for the administration of the local property tax. Thus, the September 27 vote of the city council of Gloucester served to execute the existing tax laws. Due to its primarily executive character, the setting of the tax factor does not constitute a "measure," and is not subject to the referendum petition process.
*342 Our conclusion rests on one other consideration. We have held that prudential concerns of efficient government warrant placing certain limitations on the definition of "measure." "In ascertaining the intent of the Legislature with respect to the scope and nature of the referendum powers that it has conferred, it is appropriate and important to consider what the consequences of applying [them] to a particular act of legislation would be, and, if it is found that the exercise of those powers tends to destroy the efficacy of other governmental mandates, the court ought not to place such an interpretation upon the grant of the referendum powers as to bring about any such result." Gilet v. City Clerk of Lowell, 306 Mass. 170, 175-176 (1940). See Dooling v. City Council of Fitchburg, supra at 602; 5 E. McQuillin, supra at § 16.55, at 265-266.
Considerable financial difficulty could follow from a decision that a city's tax factor could be made subject to referendum petition. If the tax factor were placed on a referendum and defeated by the voters, the city would be unable to send out its tax bills and thus would be unable to collect revenue. Furthermore, this confused state of affairs could persist for an extended period of time in view of the fact that the referendum could only invalidate the particular tax factor chosen without enacting a new tax factor in its place. The city council, following a referendum defeat, would have to adopt a new tax factor, which in turn might also be subjected to a referendum challenge. The potentially indefinite delay in collecting vital tax revenues could result in extreme fiscal distress for the city and considerable unnecessary borrowing to meet municipal needs. We cannot conceive that the Legislature intended such an impractical result.
3. The case is remanded to the Superior Court where a judgment is to be entered dismissing the complaint as moot.
So ordered.
NOTES
[1]  And other registered voters in the city of Gloucester.
[2]  The mayor, the treasurer, and the acting tax collector of the city of Gloucester.
[3]  At this point it is appropriate to acknowledge the helpful brief filed by the City Solicitors and Town Counsel Association as amicus curiae.
[4]  The pertinent part of c. 43, § 42, reads as follows:

"If, within twenty days after the final passage of any measure, except a revenue loan order, by the city council or by the school committee, a petition signed by registered voters of the city, equal in number to at least twelve per cent of the total number of registered voters ... protesting against such measure or any part thereof taking effect, is filed with the city clerk, the same shall thereupon and thereby be suspended from taking effect; and the city council or the school committee ... shall immediately reconsider such measure or part thereof; and if such measure or part thereof is not entirely rescinded, the city clerk shall submit the same ... to a vote of the registered voters of the city ... and such measure or part thereof shall forthwith become null and void unless a majority of the registered voters voting on the same at such election vote in favor thereof."
Section 9.3 of the Gloucester city charter parallels the statute.
[5]  A virtually identical definition of "measure" is contained in § 10.9(i) of the Gloucester city charter.
