This is an appeal from an order of the Savings and Loan Commissioner approving a charter for an additional savings and loan association in Longview, Gregg County, Texas. See Tex.Rev.Civ.Stat.Ann. art. 852a. The applicant, to be known as the Gregg County Savings and Loan Association, is a petitioner here. The application was opposed by three existing savings and loan associations in Gregg County, known as Metropolitan Savings and Loan Association, Kilgore Savings and Loan Association, and Longview Savings and Loan Association. The trial court sustained the approval order of the Commissioner, also a petitioner here, but this judgment was reversed by the Court of Civil Appeals and the proceeding was remanded to the Commissioner with instructions to deny the charter application. 535 S.W.2d 35. We modify the judgment of the Court of Civil Appeals to the extent of instructing the Commissioner to proceed in accordance with this opinion.

The Court of Civil Appeals determined that the contestants, respondents here, were denied due process by the hearing examiner in his exclusion from the administrative record of competent and material evidence proffered by the contestants.^[1] We granted writ of error to resolve the question of whether an approval order of the Savings and Loan Commission is invalid for arbitrariness when the contesting parties are denied due process of law in the conduct of the administrative hearing, notwithstanding that under the record as made, the order may be said to have reasonable factual support under the precepts of the substantial evidence rule. We now answer this question in the affirmative.

[*13] It is the basic contention of the Attorney General on behalf of the Commissioner, and of counsel for the applicant association, that the only test to be considered by the courts in determining the issue of arbitrariness vel non of an approval order of the Savings and Loan Commissioner is whether the order is supported by substantial evidence. The argument in effect is that a denial of due process in the administrative hearing becomes immaterial and beside the point if the order can be said to have reasonable evidentiary support in the administrative record.

Broadly speaking, the substantial evidence rule is a court review device to keep the courts out of the business of administering regulatory statutes enacted by the Legislature; but it remains the business of the courts to see that justice is administered to competing parties by governmental agencies. As stated by Professor Davis in his Administrative Law Treatise, Vol. 4, § 29.01: “Although the scope of judicial review of administrative action ranges from zero to one hundred per cent, that is, from complete unreviewability to complete substitution of judicial judgment on all questions, the dominant tendency in both state courts and federal courts is toward the middle position known as the substantial-evidence rule. Under this rule, the court decides questions of law but it limits itself to the test of reasonableness in reviewing findings of fact. Broadly, questions of law include not only common law, statutory interpretation, and constitutional law, but also questions of administrative jurisdiction, of fair administrative procedure, and of protection against arbitrary or capricious action or abuse of discretion.”

In Texas, the substantial evidence rule had its origin in appeals from orders of administrative agencies under statutes requiring de novo review in court. In this type of appeal the evidence is heard anew by the court and the conduct of the administrative hearing, and the evidence heard by the agency, are of secondary, if any, importance. Trapp v. Shell Oil Company, 145 Tex. 323, 198 S.W.2d 424 (1946); Cook Drilling Company v. Gulf Oil Corporation, 139 Tex. 80, 161 S.W.2d 1035 (1942); Shupee v. Railroad Commission of Texas, 123 Tex. 521, 73 S.W.2d 505 (1934). In practical result, it has not taken much evidence under our decisions to qualify as substantial. In fact, the evidence may be substantial and yet greatly preponderate the other way. Cf. Gerst v. Goldsbury, 434 S.W.2d 665 (Tex.1968). Moreover, most contested administrative decisions are made in the context of disputed facts with evidence of a substantial nature on both sides. Even so, the proceedings of an administrative agency must meet the requirements of due process of law. Miller v. Railroad Commission, 363 S.W.2d 244 (Tex.1962); Railroad Commission v. Alamo Express, 158 Tex. 68, 308 S.W.2d 843 (1958); Francisco v. Board of Dental Examiners, 149 S.W.2d 619 (Tex.Civ.App.1941, error ref’d).

We recognized in Gerst v. Nixon, 411 S.W.2d 350 (Tex.1966) that Article 852a § 11.12, relating to judicial review of an order of the Savings and Loan Commissioner, does not provide for the application of the test or procedures usually employed in determining the validity of an administrative order; and further, that a hearing before a hearing officer of the Savings and Loan Commissioner is a different proceeding from the informal hearing considered by this Court in Cook Drilling Company v. Gulf Oil Corporation, supra. We also said that the effect of Article 852a was to adopt the rule that the Commissioner’s order is to stand or fall upon the evidence adduced and matters noticed at the Commissioner’s hearing and not upon evidence originally produced at a subsequent trial de novo in court. However, the method of review, i. e., under the substantial evidence rule, is unchanged. Gerst v. Oak Cliff Savings and Loan Association, 432 S.W.2d 702 (Tex.1968). What occurs, then, at the administrative hearing becomes of paramount importance in the statutory procedures established by Article 852a. If there is evidence in an administrative record that can be said to qualify as substantial, the parties may yet have been denied due process and the rudiments of fair play in the conduct of the[*14] administrative hearing that produced the record upon which the agency acted. See Reavley, Substantial Evidence and Insubstantial Review in Texas, 23 S.W.L.J. 239 (1969); Berger, Administrative Arbitrariness and Judicial Review, 65 Colum.L.Rev. 55 (1965); Jaffe, The Right to Judicial Review, 71 Harv.L.Rev. 401 (1958).

As indicated earlier, our primary concern in granting writ of error was whether the parties opposing the charter application were denied due process by rulings of the hearing examiner that excluded competent and material evidence from the administrative record, thus precluding its consideration by the Commissioner in his decision process. This is particularly represented by the exclusion from the record of what is identified as Contestant’s Exhibit 34, and for the reasons now to be stated we hold that the opposing parties were denied due process by this ruling.

The case of the applicant for a charter to establish a fourth savings and loan association in Longview, Gregg County, Texas, rested principally upon the testimony of Dr. Robert Branson of Bryan, Texas, as an economic-expert witness. It is evident from the approval order of the Commissioner that he was greatly influenced by the testimony of this witness in reaching his decision favorable to the application. It was shown that Dr. Branson had supported similar applications in prior proceedings and that in his testimony he had employed certain tests or standards in reaching his expert opinion regarding the need for additional savings and loan facilities. The methodology employed by Dr. Branson was demonstrated in Contestant’s Exhibit 3 which was admitted into evidence by the hearing examiner for the purpose of showing “the procedure this expert witness has used in the past.” Exhibit 3 contained a series of tables or ratios prepared by Dr. Branson in an earlier study in support of his testimony in a prior proceeding. Gregg County was utilized in this study as a comparable county.

The evidence identified as Contestant’s Exhibit 34 was prepared by Dr. James R. Vinson, an expert witness for the contesting parties. The Exhibit was predicated upon the methodology of Dr. Branson as exhibited in Exhibit 3, with the economic information updated with respect to Gregg County, Texas. This information was displayed in the manner previously used by Dr. Branson and Exhibit 34 demonstrated that on the basis of the update, Gregg County, Texas was at the opposite end of the scale from the tests or standards previously utilized by Dr. Branson. This witness had previously found a need for a new association in the fact that the existing associations had a high buying income per association, whereas Gregg County was shown to have the lowest buying income per association. Similarly, Dr. Branson had previously found a need for a new association because of a low assets per capita figure, whereas Gregg County was shown to have the highest assets per capita. Finally, Dr. Branson had previously found need because of a high ratio of income to assets, whereas Gregg County was shown to have the lowest ratio of income to assets.

In our view, the evidence reflected in Exhibit 34 was clearly competent and relevant and the error in its exclusion required the reversal by the Court of Civil Appeals of the judgment of the trial court and the remand of the proceeding to the Commissioner. From our study of the record we do not consider that Exhibit 34 was offered by the Contestants for the purpose of establishing a norm or standard, or criterion, as argued by petitioners. Nor do we regard the evidence as cumulative even if, as asserted by petitioners without record references, “all of the facts in Exhibit 34 pertaining to Gregg County were in evidence before the Commissioner.” It is apparent to us that these arguments misconceive the evidentiary function and effect of Exhibit 34. The evidence in the Exhibit was proffered for the purpose of impeaching the testimony of Dr. Branson and might well have been viewed by the Commissioner as doing so. In such purpose and effect, the evidence also tended to weaken the eviden-tiary support for an additional savings and[*15] loan association in Gregg County, Texas. Of course, we cannot determine what influence this excluded evidence might have had upon the Commissioner in his decision process. At the least, its exclusion may have affected the result, and in fairness to the opposing parties the Commissioner should have had such evidence before him. Moreover, this comports with the statutory directive of § 11.11(2) of Article 852a that “[0]pportunity shall be afforded any interested party to respond and present evidence and argument on all issues involved in any hearing held under any provision of this Act.”

Professor Cooper in his treatise on state administrative law draws these conclusions:

The exclusion of proper evidence may vitiate the agency’s decision, if it appears that its exclusion may have affected the result. State courts agree with decisions in the federal courts that refusal to receive competent and material evidence may be a denial of due process. The requirement that proper evidence be received is a necessary counterpart of the rule that the agency must give due weight to all the evidence before it; refusal to consider proper evidence which has been duly proffered falls within the condemnation that voids arbitrary administrative action.

If it appears that the excluded evidence could not materially have affected the outcome of the case — if a remand to receive and consider the evidence improperly excluded would amount to nothing more than “a postponement of the inevitable,” the error committed is not prejudicial. But normally it is impossible for a reviewing court to be assured that the outcome could not have been affected by the consideration of the excluded testimony, and in the usual case the necessary result of the exclusion of proper testimony is to void the administrative order. Cooper, State Administrative Law, Vol. I (1965) pp. 403, 404.

The governing rule was stated in Donnelly Garment Co. v. NLRB, 123 F.2d 215 (8th Cir. 1941), and restated with approval in NLRB v. Burns, 207 F.2d 434 (8th Cir. 1953), as follows:

“That a refusal by an administrative agency such as the National Labor Relations Board to receive and consider competent and material evidence offered by a party to a proceeding before it, amounts to a denial of due process is not open to debate. * * * That the Board would or might have reached no different conclusion had the rejected evidence been received, is entirely beside the point. The truth is that a controversy tried before a court or before an administrative agency is not ripe for decision until all competent and material evidence proffered by the parties has been received and considered.

In the eyes of the law there is no hearing unless a fair opportunity is afforded the parties to prove their case before an administrative agency. People ex rel. Hirschberg v. Board of Supervisors, 251 N.Y. 156, 167 N.E. 204, 211 (1929). See also Gallant’s Case, 326 Mass. 507, 95 N.E.2d 536 (1950); Prince v. Industrial Comm’n, 89 Ariz. 314, 361 P.2d 929 (1961).

The decision of the Savings and Loan Commissioner is not governed by the precepts of the substantial evidence rule, and his responsibility is not one of determining if a particular result will be supportable by application of the rule to the administrative record. To the contrary, the decision of the Commissioner is to be in the public interest after full consideration of all the surrounding facts and circumstances, and in fairness and justice to the competing parties. Essential to the discharge of this responsibility is an administrative record that presents the relevant and material facts, and a determination by the courts of whether a particular administrative record fairly does so requires an examination of the whole record. Article 852a does not establish a self-contained administrative process unreviewable by the courts for arbitrariness if the administrative record, no matter how it came about, can be said to contain substantial evidence in support of the ultimate action of the Commissioner.

[*16] This is not to say that an order of the Commissioner is always insecure in court if the hearing examiner has made mistakes in the admission or exclusion of evidence, or in other respects. Nor is it to say that a hearing examiner, who may or may not be trained or experienced in the law, must measure up to judicial standards in the conduct of an administrative hearing.^[2] But it is to say, as we said in Gerst v. Nixon, 411 S.W.2d 350 (Tex.1966) that arbitrary action of an administrative agency cannot stand. There is arbitrariness where the treatment accorded parties in the administrative process denies them due process of law. While we recognized in Gerst v. Nixon that the test generally applied by the courts in determining the issue of arbitrariness is whether or not the administrative order is reasonably supported by substantial evidence, we made clear in the original opinion and again on Motion for Rehearing that the record there did not present a question of procedural due process.

The judgment of the Court of Civil Appeals is modified so as to remand this proceeding to the Savings and Loan Commissioner for further proceedings consistent with this opinion; and as so modified, the judgment of the Court of Civil Appeals is affirmed. This modification will permit the Commissioner to order a reopening of the hearings and thereafter to reconsider his decision. See Article 852a § 11.12(6) and First Savings & Loan Ass’n of Del Rio, Texas v. Lewis, 512 S.W.2d 62 (Tex.Civ.App.1974, writ ref’d n.r.e.).