MEMORANDUM
JAMES R. MILLER, Jr., District Judge.
The twelve named plaintiffs, female social workers (nine) and psychiatric nurses (three), are classified employees of the defendant public health authorities1 assigned to the Prince George’s County Directorate of Mental Health to provide primary psychotherapeutic health care to patients of the Directorate. They allege that the defendants violate Title VII, 42 U.S.C. § 2000e et seq.; the Equal Pay Act of 1963, 29 U.S.C. § 206(d); and 42 U.S.C. § 1983 by paying to social workers and nurses (allegedly professions populated by women) less money than to psychologists (allegedly a profession populated by men) for substantially the same line-staff or primary health chre responsibilities. Pending before the court is the plaintiffs’ motion for certification of themselves as representatives of a class of thirty-one plaintiffs, namely all past and present social workers and nurses [635]*635employed in the Directorate (listed Paper 33, PX B), to prosecute the Title VII claim.2 Paper 33.
Although a hearing has been requested, the court believes none is required. Local Rule 6.
I
THE TITLE VII CASE3
In their Amended Complaint, the plaintiffs allege:
“The actions of the Defendants in creating and utilizing a job classification system based on traditionally male and female occupations without regard to the work actually performed by the Plaintiffs and other team members, in paying the Plaintiffs substantially less in base and supplemental compensation than that paid to male team members, pursuant to the job classification system aforesaid, and in imposing terms and conditions of employment different from those imposed upon male team members constitute discrimination against the Plaintiffs on the basis of sex in violation of the Civil Rights Act of 1964, as amended, 42 U.S.C. § 2000e-2(a)(l) and (2).”
Amended Complaint ¶ 14, Paper 19.
This allegation encompasses both a complaint of disparate treatment of men and women in the creation of the classification scheme and the concomitant assignment of salary levels and other terms of employment and also a complaint of disparate effect on men and women without business necessity in the use of the present classification scheme. See generally International Brotherhood of Teamsters v. United States, 431 U.S. 324, 335-36 n. 15, 97 S.Ct. 1843, 52 L.Ed.2d 396 (1977).4
[636]*636To the extent plaintiffs pursue the disparate treatment analysis, proof of discriminatory intent in the creation of the classification scheme will be both crucial, id, and also invariable from plaintiff to plaintiff.
To the extent the plaintiffs pursue the disparate impact analysis,5 proof that the present classification scheme has a discriminatory effect, usually a statistically based proof, would be applicable to all plaintiffs.6 Similarly, the defendants proffer no explanation of how their proof on job relatedness of the classification scheme would vary for consolidated individual claims or for a class suit. Indeed, it seems that proof of the job relatedness of the employment practice of employing a mix of professionally trained individuals to perform the same tasks might necessitate a general evaluation of the agency’s current, past and potential missions and of the professions’ relative strengths and weaknesses. Proof of the job relatedness of the alleged practice of paying more to holders of degrees at the Ph.D. or masters level in psychology than to holders of equivalent degrees in social work or nursing might necessitate a general evaluation of supply and demand factors in the respective work forces and labor markets, irrespective of whether the suit is handled as a collection of consolidated individual claims or a class action. Finally, plaintiffs’ proof of an equally effective alternative practice would also vary little, if any, from an individual to a class based case.
The Title VII claims appear to be ones common to all members of the purported class.
II
The plaintiff bears the burden of showing that the prerequisites of Rule 23, F.R.Civ.P., are satisfied: (a) an adequate class definition, (b) numerosity, (c) common questions of law or fact, (d) typicality, and (e) satisfaction of one paragraph of Rule 23(b). E. g., Duncan v. State of Maryland, 78 F.R.D. 88 (D.Md.1978); Byrd v. Local 24, I. B. E. W., 14 EPD ¶ 7761 (D.Md.1977).
A. Class Definition
With two exceptions affecting five proposed class members, the thirty-one7 class members are identified by name in Plaintiff’s Exhibit B, and no definitional problem is posed.
Two proposed class members left the employ of defendants more than 180 days prior to November 24,1975, the day on which named plaintiffs filed their administrative charges of discrimination with the EEOC and the Maryland Commission on Human Relations. PX B (Marcia Dienelt, Nov. 1973-Mar. 18,1975; Joan Gordon, Nov. 21, 1973-May 13, 1975). Although a person [637]*637to whom the Title VII defendants are liable may win backpay for a period extending back two years prior to the filing of the administrative charge, 42 U.S.C. § 2000e-5(g), the defendants are liable only to persons injured within 180 days of the filing of the charge of discrimination. Id. 2000e-5(e); Wetzel v. Liberty Mutual Ins. Co., 508 F.2d 239, 246 (3d Cir. 1975); Byrd, 14 EPD at 5752. See United Air Lines, Inc. v. Evans, 431 U.S. 553, 97 S.Ct. 1885, 52 L.Ed.2d 571 (1977). These two individuals must be excluded from the class.
A more intriguing question is posed by the plaintiffs’ proposal to include three male social workers in the plaintiff class. PX B (James Reinsel, Russell Wade, Edwin Wilmslow). Conceivably the Article III injury in fact component of standing could be satisfied by the assertions that but for defendants’ sexually discriminatory job classification scheme there would be only one job classification, that the hypothetical job would pay more than the current job, and that these three male social workers would be so employed. Cf., e. g., O’Shea v. Littleton, 414 U.S. 488, 94 S.Ct. 669, 38 L.Ed.2d 674 (1974); Sierra Club v. Morton, 405 U.S. 727, 92 S.Ct. 1361, 31 L.Ed.2d 636 (1972); Association of Data Processing Service Organizations, Inc. v. Camp,
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MEMORANDUM
JAMES R. MILLER, Jr., District Judge.
The twelve named plaintiffs, female social workers (nine) and psychiatric nurses (three), are classified employees of the defendant public health authorities1 assigned to the Prince George’s County Directorate of Mental Health to provide primary psychotherapeutic health care to patients of the Directorate. They allege that the defendants violate Title VII, 42 U.S.C. § 2000e et seq.; the Equal Pay Act of 1963, 29 U.S.C. § 206(d); and 42 U.S.C. § 1983 by paying to social workers and nurses (allegedly professions populated by women) less money than to psychologists (allegedly a profession populated by men) for substantially the same line-staff or primary health chre responsibilities. Pending before the court is the plaintiffs’ motion for certification of themselves as representatives of a class of thirty-one plaintiffs, namely all past and present social workers and nurses [635]*635employed in the Directorate (listed Paper 33, PX B), to prosecute the Title VII claim.2 Paper 33.
Although a hearing has been requested, the court believes none is required. Local Rule 6.
I
THE TITLE VII CASE3
In their Amended Complaint, the plaintiffs allege:
“The actions of the Defendants in creating and utilizing a job classification system based on traditionally male and female occupations without regard to the work actually performed by the Plaintiffs and other team members, in paying the Plaintiffs substantially less in base and supplemental compensation than that paid to male team members, pursuant to the job classification system aforesaid, and in imposing terms and conditions of employment different from those imposed upon male team members constitute discrimination against the Plaintiffs on the basis of sex in violation of the Civil Rights Act of 1964, as amended, 42 U.S.C. § 2000e-2(a)(l) and (2).”
Amended Complaint ¶ 14, Paper 19.
This allegation encompasses both a complaint of disparate treatment of men and women in the creation of the classification scheme and the concomitant assignment of salary levels and other terms of employment and also a complaint of disparate effect on men and women without business necessity in the use of the present classification scheme. See generally International Brotherhood of Teamsters v. United States, 431 U.S. 324, 335-36 n. 15, 97 S.Ct. 1843, 52 L.Ed.2d 396 (1977).4
[636]*636To the extent plaintiffs pursue the disparate treatment analysis, proof of discriminatory intent in the creation of the classification scheme will be both crucial, id, and also invariable from plaintiff to plaintiff.
To the extent the plaintiffs pursue the disparate impact analysis,5 proof that the present classification scheme has a discriminatory effect, usually a statistically based proof, would be applicable to all plaintiffs.6 Similarly, the defendants proffer no explanation of how their proof on job relatedness of the classification scheme would vary for consolidated individual claims or for a class suit. Indeed, it seems that proof of the job relatedness of the employment practice of employing a mix of professionally trained individuals to perform the same tasks might necessitate a general evaluation of the agency’s current, past and potential missions and of the professions’ relative strengths and weaknesses. Proof of the job relatedness of the alleged practice of paying more to holders of degrees at the Ph.D. or masters level in psychology than to holders of equivalent degrees in social work or nursing might necessitate a general evaluation of supply and demand factors in the respective work forces and labor markets, irrespective of whether the suit is handled as a collection of consolidated individual claims or a class action. Finally, plaintiffs’ proof of an equally effective alternative practice would also vary little, if any, from an individual to a class based case.
The Title VII claims appear to be ones common to all members of the purported class.
II
The plaintiff bears the burden of showing that the prerequisites of Rule 23, F.R.Civ.P., are satisfied: (a) an adequate class definition, (b) numerosity, (c) common questions of law or fact, (d) typicality, and (e) satisfaction of one paragraph of Rule 23(b). E. g., Duncan v. State of Maryland, 78 F.R.D. 88 (D.Md.1978); Byrd v. Local 24, I. B. E. W., 14 EPD ¶ 7761 (D.Md.1977).
A. Class Definition
With two exceptions affecting five proposed class members, the thirty-one7 class members are identified by name in Plaintiff’s Exhibit B, and no definitional problem is posed.
Two proposed class members left the employ of defendants more than 180 days prior to November 24,1975, the day on which named plaintiffs filed their administrative charges of discrimination with the EEOC and the Maryland Commission on Human Relations. PX B (Marcia Dienelt, Nov. 1973-Mar. 18,1975; Joan Gordon, Nov. 21, 1973-May 13, 1975). Although a person [637]*637to whom the Title VII defendants are liable may win backpay for a period extending back two years prior to the filing of the administrative charge, 42 U.S.C. § 2000e-5(g), the defendants are liable only to persons injured within 180 days of the filing of the charge of discrimination. Id. 2000e-5(e); Wetzel v. Liberty Mutual Ins. Co., 508 F.2d 239, 246 (3d Cir. 1975); Byrd, 14 EPD at 5752. See United Air Lines, Inc. v. Evans, 431 U.S. 553, 97 S.Ct. 1885, 52 L.Ed.2d 571 (1977). These two individuals must be excluded from the class.
A more intriguing question is posed by the plaintiffs’ proposal to include three male social workers in the plaintiff class. PX B (James Reinsel, Russell Wade, Edwin Wilmslow). Conceivably the Article III injury in fact component of standing could be satisfied by the assertions that but for defendants’ sexually discriminatory job classification scheme there would be only one job classification, that the hypothetical job would pay more than the current job, and that these three male social workers would be so employed. Cf., e. g., O’Shea v. Littleton, 414 U.S. 488, 94 S.Ct. 669, 38 L.Ed.2d 674 (1974); Sierra Club v. Morton, 405 U.S. 727, 92 S.Ct. 1361, 31 L.Ed.2d 636 (1972); Association of Data Processing Service Organizations, Inc. v. Camp, 397 U.S. 150, 90 S.Ct. 827, 25 L.Ed.2d 184 (1970). However, the language of Title VII creates a claim for relief only when the employer discriminates “against any individual with respect to his compensation . . . because of such individual’s . . . sex . . . .” 42 U.S.C. § 2000e-2(a)(l). Accord, Cox v. Allied Chemical Corp., 538 F.2d 1094, 1099 (5th Cir. 1976); EEOC v. Beaver Gasoline Co., 14 FEP Cases 1343 (E.D.Pa.1977). These three male individuals must be excluded from the class. (Since plaintiffs requested a further opportunity to submit argument on this issue, a motion to expand the class may be filed not less than one month prior to the pretrial conference date.)
B. Numerosity
The proposed class now numbers twenty-six of whom twelve are already named plaintiffs. This number is within that middling range where the determination of the practicality of joinder, Rule 23(a)(1), F.R.Civ.P., can be made only in light of the other Rule 23 prerequisites and the particular facts of a case. E. g., Duncan, supra.
A significant factor in this Title VII case is that if class certification were denied and the absent similarly situated women permitted to intervene as additional named plaintiffs, then the delay and distraction resulting from their exhaustion of their Title VII administrative remedies prior to their intervention here might impede the disposition of this case. No good reason for such a result has been offered. Rule 1, F.R.Civ.P., mandates that the Rules “. .be construed to secure the just, speedy, and inexpensive determination of every action.”
C., D. Common Questions, Typicality
From the discussion in Part I, supra, it is apparent that there are common questions of fact and perhaps of law. In addition, should the plaintiffs prevail, the remedy of establishment of a restructured job classification scheme would apply to all. Byrd, supra at 5747-5748.
E. Representativeness
Based on a review of the pleadings filed in this case, the court believes that plaintiffs’ counsel are suitably experienced, skilled, and diligent. The named plaintiffs clearly have a personal stake in this litigation, and no antagonism between the interests of the named plaintiffs and the class appears at this time. Id. at 5748-5749.
F. Rule 23(b)(2)
Finally, if the claims of the plaintiffs be assumed meritorious for purposes of the class certification motion, as they must be, then the defendants have acted on a ground applicable to the class as a whole and final injunctive or declaratory relief would be appropriate. Id. at 5749. It is not necessary to decide whether certification under [638]*638Rule 23(b)(3), as requested, would also be appropriate.