NEUMANN, Justice.
The Olsons appeal from summary judgment dismissing their tort action against the City of Garrison for damages resulting from a broken water main. We affirm.
In November 1991 a break occurred in a City of Garrison water main adjacent to the building housing Art and Sharon Olson’s silk screening business. The break flooded the basement of the Olsons’ business with fourteen to eighteen inches of water and damaged or destroyed machinery and inventory. The record reveals at least one other break had occurred in the vicinity a few months earlier. According to the city engineer, no normal maintenance procedure can prevent water mains from breaking.
The record also reveals decisions concerning the operation and maintenance of the City’s water main system were based upon various factors. These factors included the historical performance of the water main, the cost of repairing versus replacing the water main, the ability of the City to participate in grants or federally aided projects, and the condition of overlying streets.
The Olsons brought a tort action against the City for damages resulting from the broken water main; specifically, the Olsons alleged negligence. The City, in turn, moved for summary judgment, alleging the action was barred by the discretionary function exception to governmental liability. Following a hearing, the City’s motion was granted. The Olsons appeal from that judgment.
Summary judgment is appropriate when, after viewing evidence most favorable to the party against whom summary judgment is sought, there exists no genuine issue of material fact in dispute. Berg v. Lien, 522 N.W.2d 455, 456 (N.D.1994). Even if factual disputes exist, they are not material unless resolution would alter the ultimate outcome. Id. However, we need not determine whether the Olsons have presented facts sufficient to survive summary judgment because we conclude the discretionary function exception to governmental liability provides immunity to the City of Garrison for the operation and maintenance of its water main system.
The discretionary function exception first appeared in Kitto v. Minot Park District, 224 N.W.2d 795 (N.D.1974), in which the court abolished the doctrine of governmental immunity, id. at 797, but retained some immunity for discretionary acts, stating:
... immunity [will be] retained for certain acts which go to the essence of governing. We do not contemplate that the essential acts of governmental decision-making be the subject of judicial second-guessing or harassment by the actual or potential threat of litigation. We hold that no tort action will lie against governmental units for those acts which may be termed discretionary in character. Included within this category are acts traditionally deemed legislative or quasi-legislative, or judicial or quasi-judicial, in nature.
Id. at 804 (emphasis added) (citations omitted). This discretionary function exception, now found in section 32-12.1-03(3) of the North Dakota Century Code, frames the analysis in the instant case.
Section 32-12.1-03(3) was enacted by the North Dakota Legislature in response to the Kitto decision and for the purpose of limiting governmental liability. O’Fallon v. Pollard, [665]*665427 N.W.2d 809, 811 (N.D.1988). It reads in relevant part:
3. A political subdivision is not liable for any claim based upon an act or omission of an employee of a political subdivision, exercising due care, in the execution of a statute or regulation whether or not such statute or regulation be valid, or based, upon the exercise or performance, exercising due care, or the failure to exercise or perform a discretionary function or duty on the part of a political subdivision or its employees, whether or not the discretion involved be abused.
NDCC § 32-12.1-03(3) (Supp.1995).1 Apparently this language comes directly from the language used in the Federal Tort Claims Act.2 Compare NDCC § 32-12.1-03(3) mth 28 U.S.C. § 2680(a) (1994).
The problem that has plagued many courts, however, is defining a test for determining the scope of the discretionary function exception, or stated differently, for determining which governmental acts are discretionary. The Kitto court did not solve this problem definitively. Thus, it is necessary to examine briefly the law in North Dakota to see if it has been addressed elsewhere.
Two other tests for addressing the problem have been considered and subsequently rejected or at least not explicitly adopted in North Dakota. Those tests are the distinction between immune governmental acts and non-immune proprietary acts, and the distinction between immune planning acts and non-immune operational acts.3 Kit[666]*666to, 224 N.W.2d at 805 (repudiating the governmental/proprietary distinction, character-king it as a “quagmire”); Sande v. City of Grand Forks, 269 N.W.2d 93, 98 (N.D.1978) (recognizing the planning/operational distinction as helpful but not controlling). Thus, North Dakota law, with respect to the scope of the discretionary function exception, specifically the test for determining discretionary acts, is unsettled. North Dakota has yet to define its “more narrow and more rational ground for limiting [governmental] liability” under the discretionary function exception. Kitto, 224 N.W.2d at 805.
Nonetheless, the search for this limitation is not without direction. Kitto suggested this court refer to the “substantial experience in dealing with [the] discretionary function exception under the Federal Tort Claims Act” as a possible “useful source of reference,”4 224 N.W.2d at 804-05, and the North Dakota Legislature adopted essentially in whole the federal exception. Compare NDCC § 32-12.1-03(3) with 28 U.S.C. § 2680(a) (1994).
The federal discretionary function exception is based squarely on separation of powers concerns. The purpose of the exception is to “prevent judicial ‘second-guessing’ of legislative and administrative decisions grounded in social, economic, and political policy through the medium of an action in tort.” Berkovitz v. United States, 486 U.S. 531, 536-37, 108 S.Ct. 1954, 1959, 100 L.Ed.2d 531, 541 (1988). In other words, borrowing the language of the Minnesota Supreme Court, the purpose is “to assure that the courts do not pass judgment on policy decisions entrusted to coordinate branches of government ... [and to prevent] tort actions from becoming a vehicle for judicial interference with executive and legislative policymaking.” Holmquist v. State, 425 N.W.2d 230, 231 (Minn.1988).
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NEUMANN, Justice.
The Olsons appeal from summary judgment dismissing their tort action against the City of Garrison for damages resulting from a broken water main. We affirm.
In November 1991 a break occurred in a City of Garrison water main adjacent to the building housing Art and Sharon Olson’s silk screening business. The break flooded the basement of the Olsons’ business with fourteen to eighteen inches of water and damaged or destroyed machinery and inventory. The record reveals at least one other break had occurred in the vicinity a few months earlier. According to the city engineer, no normal maintenance procedure can prevent water mains from breaking.
The record also reveals decisions concerning the operation and maintenance of the City’s water main system were based upon various factors. These factors included the historical performance of the water main, the cost of repairing versus replacing the water main, the ability of the City to participate in grants or federally aided projects, and the condition of overlying streets.
The Olsons brought a tort action against the City for damages resulting from the broken water main; specifically, the Olsons alleged negligence. The City, in turn, moved for summary judgment, alleging the action was barred by the discretionary function exception to governmental liability. Following a hearing, the City’s motion was granted. The Olsons appeal from that judgment.
Summary judgment is appropriate when, after viewing evidence most favorable to the party against whom summary judgment is sought, there exists no genuine issue of material fact in dispute. Berg v. Lien, 522 N.W.2d 455, 456 (N.D.1994). Even if factual disputes exist, they are not material unless resolution would alter the ultimate outcome. Id. However, we need not determine whether the Olsons have presented facts sufficient to survive summary judgment because we conclude the discretionary function exception to governmental liability provides immunity to the City of Garrison for the operation and maintenance of its water main system.
The discretionary function exception first appeared in Kitto v. Minot Park District, 224 N.W.2d 795 (N.D.1974), in which the court abolished the doctrine of governmental immunity, id. at 797, but retained some immunity for discretionary acts, stating:
... immunity [will be] retained for certain acts which go to the essence of governing. We do not contemplate that the essential acts of governmental decision-making be the subject of judicial second-guessing or harassment by the actual or potential threat of litigation. We hold that no tort action will lie against governmental units for those acts which may be termed discretionary in character. Included within this category are acts traditionally deemed legislative or quasi-legislative, or judicial or quasi-judicial, in nature.
Id. at 804 (emphasis added) (citations omitted). This discretionary function exception, now found in section 32-12.1-03(3) of the North Dakota Century Code, frames the analysis in the instant case.
Section 32-12.1-03(3) was enacted by the North Dakota Legislature in response to the Kitto decision and for the purpose of limiting governmental liability. O’Fallon v. Pollard, [665]*665427 N.W.2d 809, 811 (N.D.1988). It reads in relevant part:
3. A political subdivision is not liable for any claim based upon an act or omission of an employee of a political subdivision, exercising due care, in the execution of a statute or regulation whether or not such statute or regulation be valid, or based, upon the exercise or performance, exercising due care, or the failure to exercise or perform a discretionary function or duty on the part of a political subdivision or its employees, whether or not the discretion involved be abused.
NDCC § 32-12.1-03(3) (Supp.1995).1 Apparently this language comes directly from the language used in the Federal Tort Claims Act.2 Compare NDCC § 32-12.1-03(3) mth 28 U.S.C. § 2680(a) (1994).
The problem that has plagued many courts, however, is defining a test for determining the scope of the discretionary function exception, or stated differently, for determining which governmental acts are discretionary. The Kitto court did not solve this problem definitively. Thus, it is necessary to examine briefly the law in North Dakota to see if it has been addressed elsewhere.
Two other tests for addressing the problem have been considered and subsequently rejected or at least not explicitly adopted in North Dakota. Those tests are the distinction between immune governmental acts and non-immune proprietary acts, and the distinction between immune planning acts and non-immune operational acts.3 Kit[666]*666to, 224 N.W.2d at 805 (repudiating the governmental/proprietary distinction, character-king it as a “quagmire”); Sande v. City of Grand Forks, 269 N.W.2d 93, 98 (N.D.1978) (recognizing the planning/operational distinction as helpful but not controlling). Thus, North Dakota law, with respect to the scope of the discretionary function exception, specifically the test for determining discretionary acts, is unsettled. North Dakota has yet to define its “more narrow and more rational ground for limiting [governmental] liability” under the discretionary function exception. Kitto, 224 N.W.2d at 805.
Nonetheless, the search for this limitation is not without direction. Kitto suggested this court refer to the “substantial experience in dealing with [the] discretionary function exception under the Federal Tort Claims Act” as a possible “useful source of reference,”4 224 N.W.2d at 804-05, and the North Dakota Legislature adopted essentially in whole the federal exception. Compare NDCC § 32-12.1-03(3) with 28 U.S.C. § 2680(a) (1994).
The federal discretionary function exception is based squarely on separation of powers concerns. The purpose of the exception is to “prevent judicial ‘second-guessing’ of legislative and administrative decisions grounded in social, economic, and political policy through the medium of an action in tort.” Berkovitz v. United States, 486 U.S. 531, 536-37, 108 S.Ct. 1954, 1959, 100 L.Ed.2d 531, 541 (1988). In other words, borrowing the language of the Minnesota Supreme Court, the purpose is “to assure that the courts do not pass judgment on policy decisions entrusted to coordinate branches of government ... [and to prevent] tort actions from becoming a vehicle for judicial interference with executive and legislative policymaking.” Holmquist v. State, 425 N.W.2d 230, 231 (Minn.1988).
Keeping in mind the importance of the concern for separation of powers, federal law has developed two inquiries to determine whether particular governmental conduct falls under the discretionary function exception. The focus of the inquiries is on “the nature of the conduct [not] the status of the actor.” Berkovitz, 486 U.S. at 536, 108 S.Ct. at 1958, 100 L.Ed.2d at 540 (quoting United States v. S.A. Empresa de Viacao Aerea Rio Grandense (Varig Airlines), 467 U.S. 797, 813, 104 S.Ct. 2755, 2764, 81 L.Ed.2d 660, 674 (1984)). “In examining the nature of the challenged conduct, [the first inquiry a court must consider is] whether the action is a matter of choice for the acting employee.” Id. “[C]onduct cannot be discretionary unless it involves an element of judgment or choice.” Id. Thus, the discretionary function exception will not apply when a ... statute, regulation, or policy specifically prescribes a course of action for an employee to follow [because] “the employee has no rightful option but to adhere to the directive,” id., and because “the government has restricted its own discretion” through the directive. David S. Fishback & Gail Killefer, The Discretionary Function Exception To The Federal Tort Claims Act: Dalehite To Varig To Berkovitz, 25 Idaho L.Rev. 291, 298 (1988-89). Moreover, the directive must be specific and mandatory as opposed to a general statutory duty. Kennewick Irrigation District v. United States, 880 F.2d 1018, 1026 (9th Cir.1989).
[667]*667Turning to the instant case, the governmental conduct challenged by the Olsons is the operation and maintenance by the City of Garrison of its water main system. The Olsons have not identified a specific and mandatory statute, regulation, or policy that prescribes a course of action for the City’s operation and maintenance of its water mains. Although an independent search by this court did reveal statutes and regulations governing, for example, the certification of water distribution system operators, NDCC ch. 23-26 (1991 & Supp.1995); N.D.Admin.Code art. 33-19 (1994), it did not reveal a specific and mandatory directive governing the operation and maintenance of a city’s water main system.
Nevertheless, as indicated by the record, the City does consider various factors when making decisions about the operation and maintenance of its water mains. These factors include the historical performance of the water main, the cost of repairing versus replacing the water main, the ability of the City to participate in grants or federally aided projects, and the condition of overlying streets. These factors guide the City’s decisions generally and involve discretion or judgment and are not specific and mandatory directives. See, e.g., Kennewick, 880 F.2d at 1026-32. Stated differently, the factors “do not contain directives so precise that they constrain the [City’s] control” over the operation and maintenance of its water main system. Cope v. Scott, 45 F.3d 445, 450 (D.C.Cir.1995) (denying challenge to government’s maintenance of a road where Park Service manual was applicable only “to the extent practicable ... the essence of discretion”); Baum v. United States, 986 F.2d 716, 722-24 (4th Cir.1993) (denying challenge to government’s “judgments involving when and how to maintain its bridges and guardrails” where no specific and mandatory directive governed those judgments); cf. ARA Leisure Services v. United States, 831 F.2d 193, 195 (9th Cir.1987) (upholding challenge to government’s maintenance of a road in which Park Service standards had “explicit” requirements for road conditions). “Where there is room for policy judgment and decision there is discretion.” Berkovitz, 486 U.S. at 537, 108 S.Ct. at 1959, 100 L.Ed.2d at 541 (quoting Dalehite v. United States, 346 U.S. 15, 36, 73 S.Ct. 956, 968, 97 L.Ed. 1427, 1441 (1953)). Therefore, the Olsons’ tort action fails under the first inquiry.
The inquiry does not end here, however. Even if “the challenged conduct involves an element of judgment [or choice], [the second inquiry a court must consider is] whether that judgment [or choice] is of the kind that the discretionary function exception was designed to shield.” Id. at 536, 108 S.Ct. at 1959, 100 L.Ed.2d at 541. “The focus of the inquiry is not on the [government’s] subjective intent in exercising the discretion conferred ... but on the nature of the actions taken and on whether they are susceptible to policy analysis.”5 United States v. Gaubert, 499 U.S. 315, 325, 111 S.Ct. 1267, 1275, 113 L.Ed.2d 335, 348 (1991). This inquiry is more difficult to answer because it directly implicates the separation of powers concerns.
The purpose of the discretionary function exception is to “prevent judicial ‘second-guessing’ of legislative and administrative decisions grounded in social, economic, and political policy through the medium of an action in tort.” Berkovitz, 486 U.S. at 536-37, 108 S.Ct. at 1959, 100 L.Ed.2d at 541. When properly construed, the exception should shield only governmental action based on public policy considerations. Gaubert, 499 U.S. at 323, 111 S.Ct. at 1273, 113 L.Ed.2d at 346. Moreover, public policy considerations, social, economic, or political, must be distinguished from more objective standards based on, for example, scientific, engineering, or [668]*668technical considerations. Kennewick, 880 F.2d at 1030. The latter are not protected by the discretionary function exception, id., when the challenged conduct involves nothing more than a “follow the numbers” approach. Fishback, supra at 325.
In the instant case, the challenged conduct is the operation and maintenance by the City of Garrison of its water main system. The decisions concerning the conduct turn not on objective standards but on public policy considerations. Specifically, the record reveals economic considerations dictated the City’s actions regarding the water main system, and these actions can be described as “a question of how best to allocate resources.” Baum, 986 F.2d at 724.
But economic considerations, when reduced to such ingredients as budgetary constraints or choices involving whether to spend money, do not themselves insulate governmental action. Cope, 45 F.3d at 449. It is when these ingredients are combined with others that economic considerations become grounded in policy. See id. at 451. For example, and similar to Cope, the record indicates no normal maintenance procedure would have prevented the water main that damaged the Olsons’ property from breaking. See id. (stating “no regular maintenance would have prevented the road from deteriorating”); see also Baum, 986 F.2d at 723-24 (rejecting argument about how and when the government “should have” maintained a guardrail system because it is a policy-based decision). Only by balancing the previously enumerated factors, such as the cost of repairing versus replacing the water main and sources of funding, as well as others such as possible disruption to the economic activity on Main Street from excavating a water main, could the City make a judgment about an appropriate course of action. See Cope, 45 F.3d at 451 (discussing the balancing of factors such as “the allocation of funds among significant project demands ... and the inconvenience of repairs as compared to the risk of safety hazards”). This is a judgment so “inherently bound up in considerations of economic and political policy” that it cannot be subject to second-guessing by the judiciary. Baum, 986 F.2d at 724. Thus, under the second inquiry, the Olsons’ tort action challenging the City of Garrison’s operation and maintenance of its water main system cannot be sustained; the conduct is of the type intended to be shielded by the discretionary function exception.
We are not suggesting that every decision made by a city about the operation and maintenance of its water main system is or should be shielded. See Baum, 986 F.2d at 724. But since we are confined to the facts of this case, we find it “unnecessary— and indeed impossible — to define with precision every contour of the discretionary function exception.” Varig Airlines, 467 U.S. at 813, 104 S.Ct. at 2764, 81 L.Ed.2d at 674. It is sufficient to say “the legislature did not intend the ... exception to swallow the general rule” by preserving immunity for all governmental conduct. Holmquist, 425 N.W.2d at 231.
We conclude the City of Garrison’s conduct falls within the discretionary function exception. Thus we need not reach the other issues raised by the Olsons.
Affirmed.
VANDE WALLE, C.J., and LEVINE and SANDSTROM, JJ., concur.