Vulcan Material Company, which operates a granite quarry in Cobb County, and Harold Chastain, the lessor of the property, sought a variance from zoning restrictions prohibiting quarrying within 4,000 feet of a residential use and 2,000 feet from any other use. Neighbors, Bentley and Hawn, appeared at the hearing before the Cobb County Board of Zoning Appeals to object, but the variance was granted. The neighbors appealed to the Cobb Superior Court pursuant to Code Ann. § 69-1211.11 and Section 12B of the Cobb County Zoning and Planning Act,2 and demanded a de novo jury trial as provided in these laws. Vulcan and Chastain filed motions to dismiss *349on the ground that this statute and ordinance were unconstitutional. The trial court agreed insofar as these provisions allow a de novo jury determination of variance decisions rendered by the board of zoning appeals. It also required the neighbors to add the board as an additional party to the appeal. The neighbors were granted an interlocutory review of these rulings. We hold that the provisions of the statute and ordinance authorizing de novo jury appeals are unconstitutional as violating the separation of powers doctrine, and affirm.
1. Vulcan and Chastain argue that the powers delegated to the zoning board of appeals are legislative3 in nature, while the neighbors urge it functions as a judicial4 body. We do not find either argument controlling. The Board of Zoning Appeals is an administrative agency and its powers are distinct from the legislative and judicial powers established in the Georgia Constitution.
The Georgia Constitution provides that the "legislative, judicial, and executive powers shall forever remain separate and distinct,...” Ga. Const. 1976, Art. I. *350Sec. II, Par. IV (Code Ann. § 2-204). It further states that the "judicial powers of this State shall be vested in a Supreme Court, a Court of Appeals, Superior Courts, Probate Courts, Justices of the Peace, Notaries Public who are ex-officio Justices of the Peace, and such other Courts as have been or may be established by law.” Ga. Const., Art. VI, Sec. I, Par. I (Code Ann. § 2-3001). An administrative agency is "a governmental authority, other than a court and other than a legislative body, which affects the rights of private parties through either adjudication or rulemaking.” Davis, Treatise on Administrative Law, Vol. 1, § 1:2 at p. 9 (2d Ed., 1978). (Emphasis supplied.) Its powers are well described by the Maryland Court of Appeals: "The primary function of administrative agencies is to advance the will and weal of the people as ordained by their representatives — the Legislature. These agencies are created in order to perform activities which the Legislature deems desirable and necessary to forward the health, safety, welfare and morals of the citizens of this State. While these agencies at times perform some activities which are legislative in nature and thus have been dubbed as quasi-legislative duties, they in addition take on a judicial coloring in that frequently, within the exercise of their power, they are called upon to make factual determinations and thus adjudicate, and it is in that sense that they are also recurrently considered to be acting in a quasi-judicial capacity. This dual role which administrative agencies play has long been accepted in this State as being constitutionally permissible. [Cits.] However, this authority is not the same and, therefore, is distinguishable from the exercising of the 'judicial powers’ of this State. . .” Dept. of Natural Resources v. Linchester Sand &c. Corp., 274 Md. 211, 222 (334 A2d 514, 522) (1975).
In embarking on an analysis of the judicial review of administrative decisions, we not only consider the nonjudicial role of these agencies, but also must recognize the important function that administrative agencies perform at all levels of government. Whether operating in the federal, state, or local sphere, agencies provide a high level of expertise and an opportunity for specialization *351unavailable in the judicial or legislative branches. They are able to use these skills, along with the policy mandate and discretion entrusted to them by the legislature, to make rules and enforce them in fashioning solutions to very complex problems. Thus, their decisions are not to be taken lightly or minimized by the judiciary. Review overbroad in scope would have the effect of substituting the judgment of a judge or jury for that of the agency, thereby nullifying the benefits of legislative delegation to a specialized body. Since the agency is exercising neither judicial nor legislative, but administrative, powers, the separation of powers doctrine along with this policy of respect must play a role in determining the nature of the review of agency decisions by the courts.
It is axiomatic that, under the separation of powers, nonjudicial functions may not be imposed on a constitutional court. E.g., Davis, Administrative Law Treatise, Vol. 4 (1st Ed., 1958); Federal Radio Comm. v. General Electric Co., 281 U. S. 464 (50 SC 389, 74 LE 969) (1930); Dept. of Natural Resources v. Linchester Sand &c. Corp., supra; American Beauty Homes Corp. v. Louisville &c. Planning & Zoning Comm., 379 SW2d 450 (Ky. 1964); 2 AmJur2d 402 et seq., Administrative Law, §§ 579-582. "The duties or functions which the legislature may not transfer to the judiciary have been characterized as either legislative or executive. That many of these may be delegated to administrative agencies has long been acknowledged. Their descriptive classification is not, however, the significant point. The vice lies in the fact that the duties or functions sought to be conferred upon the courts lie beyond the scope of judicial power.
"If the legislature cannot impose upon the courts the administrative duty or function of making an initial discretionary decision, it cannot do so by the fiction of an appeal which requires the court to adjudicate upon administrative rather than judicial considerations.” American Beauty Homes Corp. v. Louisville &c. Planning & Zoning Comm., supra, p. 454. (Footnotes omitted.)
The statute and ordinance here on appeal provide for a de novo jury review of the zoning board of appeals’ decisions. Therefore, insofar as this statute and ordinance *352empower the courts to readjudicate questions which have already been committed to the administrative discretion of the zoning board of appeals by the governing authorities of this state and Cobb County, they are unconstitutional as burdening the courts with a nonjudicial function. Dept. of Natural Resources v. Linchester Sand &c. Corp., supra; American Beauty Homes Corp. v. Louisville &c. Planning & Zoning Comm., supra.
Textwriters in the area of administrative law urge that the focus of the courts in reviewing administrative decisions should be to evaluate the extent of discretion delegated to that agency and to see that the agency acts within the limits of its discretion in order to protect individuals against the unnecessary and uncontrolled use of that power. The focus is controlling discretion through administratively established standards and safeguards.5 Davis, Administrative Law Treatise, Vol. 1, § 3:15 (2d Ed. 1978); Cooper, State Administrative Law, Vol. 1, p. 91 (1965). Therefore, the only review authorized is that inherent in the power of the judiciary: Whether the agency acted beyond the discretionary powers conferred upon it, abused its discretion, or acted arbitrarily or capriciously with regard to an individual’s constitutional rights. Since they allow a much broader review, the trial court correctly ruled that, insofar as they provided for a de novo jury trial, the statute and Cobb County ordinance are unconstitutional.
*353Argued April 10, 1978
Decided October 4, 1978.
Downey, Cleveland & Moore, John H. Moore, Joe Parker, for appellants (Case No. 33420).
Alston, Miller & Gaines, G. Conley Ingram, Peter M. Degnan, J. Douglas Henderson, for appellees (Case No. 33420).
Smith, Cohen, Ringel, Kohler & Martin, John A. Howard, for appellant (Case No. 33421).
Alston, Miller & Gaines, G. Conley Ingram, Peter M. Degnan, J. Douglas Henderson, Awtrey, Parker, Risse, *354 Mangerie & Brantley, G. Grant Brantley, for appellees (Case No. 33421).
*353We need not reach Vulcan’s and Chastain’s arguments that the statute and ordinance are also unconstitutional because they áre too vague and because they violate the Home Rule Amendment. Nor do we reach the neighbor’s contention, raised for the first time on appeal, that the Cobb County Board of Zoning Appeals was without subject matter jurisdiction to entertain Vulcan’s variance petition.
2. The trial court also held that the Cobb County Board of Zoning Appeals is an indispensable party and should be added to the appeal. Although we do not, in this case, find that the board is an indispensable party, we do not see and we have not been shown how the neighbors have been harmed by its joinder. Therefore, we affirm.
Judgment affirmed.
All the Justices concur.
*354 Ben F. Smith, amicus curiae.