Janet Stout, Juliana Nedd, Sheila Wright and Lee Harrison (collectively, the *1121 “postal inspectors”) appeal the district court’s summary judgment in favor of the Postmaster General in their employment discrimination action alleging denial of promotion on the basis of sex. We have jurisdiction, 28 U.S.C. § 1291, and we affirm.
I
Appellants are female postal inspector team leaders in the Postal Inspection Service (“the Service”), the law enforcement branch of the United States Postal Service. They, along with 34 other postal inspectors, applied for promotion to Assistant Inspector in Charge (“AIC”), the highest non-executive managerial level in the Service. There were five open AIC positions, one each in San Francisco, Los Angeles, Houston, Milwaukee and Washington, D.C. Six of the 38 applicants who vied for these positions were women.
A review panel initially screened all applicants on the strength of their supervisor evaluations and applications. The panel identified the most qualified candidates and forwarded their names as potential interviewees to a separate selection committee that made the final hiring decisions. From the original pool of 38, the screening panel identified 10 applicants as the most qualified. None of the six female applicants was named to this list and none was initially interviewed by the selection committee.
Two female applicants were granted interviews in a second screening round which arose from unexpected circumstances. The selected candidate from the first round of interviews for the San Francisco position declined an offer. The Inspector in Charge of that office was not satisfied with the remaining candidates who were first interviewed and asked the screening panel to select additional names from the original pool of applicants. Two of the additional five applicants chosen to be interviewed were female applicants. One of these female applicants ultimately was promoted to the San Francisco AIC opening.
The postal inspectors commenced this action alleging that the Service caused them to suffer both disparate treatment and disparate impact on the basis of sex in violation of Title VII of the Civil Rights Act of 1964, 42 U.S.C. §§ 2000e to e-17. The district court granted the Service’s motion for summary judgment on both claims of discrimination. The postal inspectors now appeal, contesting only the dismissal of their disparate impact claim.
II
We review a district court’s grant of summary judgment de novo.
Lopez v. Smith,
III
A claim of disparate impact challenges “employment practices that are facially neutral in their treatment of different groups but that in fact fall more harshly on one group than another and cannot be justified by business necessity.”
Int’l Brotherhood of Teamsters v. United States,
A prima facie case of disparate impact is “usually accomplished by statistical evidence showing ‘that an employment practice selects members of a protected class in a proportion smaller than their percentage in the pool of actual applicants.’ ”
Robinson v. Adams,
IY
The district court found that no prima facie case of disparate impact was proven. Focusing on the final results of the promotion process, the district court noted that one out of six female applicants was promoted, whereas 3 out of 32 male applicants received a promotion to AIC. 1 This meant that female applicants were promoted at a rate of more than 16 percent, compared to a promotion rate for male applicants of less than 10 percent.
We do not gainsay the district court’s reasoning as it pertains to the bottom line results of the promotion process. The problem, however, is that the promotion process included an intermediate stage that functioned as a pass or fail barrier to further consideration. Promotions to AIC were offered only to applicants who were interviewed by the selection committee, and interviews were granted only to those selected by the screening panel. It is at the intermediate screening stage that the postal inspectors direct their disparate impact claims. The nonadverse results of the ultimate promotion decisions cannot refute a prima facie case of disparate impact at the dis-positive interview selection stage.
See Connecticut v. Teal, 457
U.S. 440, 452,
The postal inspectors urge us to adopt an even finer distinction. They contend that Teal requires analytical separation of the two screening rounds as well. No female applicant was selected to be interviewed in the first round. The postal inspectors wish to isolate this zero selection rate and make it the basis of their prima facie case. We see no sound reason to accept the distinction urged upon us. We separate the results of the interview selection stage from the results of the overall promotion process because the intermediate stage functioned as a pass or fail barrier to further consideration for promotion. No such barrier existed between the two screening rounds. Applicants who were not selected in the first round were again considered in the second round of interviews. Failure to be selected in the first round did not foreclose an *1123 applicant’s consideration for interview in the second round.
It is of no significance that the second round interviews were originally unplanned or limited to filling the San Francisco opening. The rationale, intent or motive underlying a challenged employment practice plays no part in a prima facie case of disparate impact.
Watson,
We now consider the statistical conclusions that can be drawn from the results of both screening rounds. We observe initially that the probative value of any statistical comparison is limited by the small available sample.
See Watson,
The first step in a statistical analysis is to identify the base population for comparison. Generally, the appropriate population is the applicant pool or relevant labor market from which the positions at issue are filled. The composition of the applicant pool or relevant labor market is then compared to the composition of the successful applicants.
See Wards Cove,
Female applicants comprised 13.3 percent (2 of 15) of all those interviewed and 15.8 percent (6 of 38) of the original applicant pool. The percentage of interviewees who are female is nearly proportional to the percentage of applicants who are female. The 2.5 percent difference is not a substantial or significant statistical disparity. 2
*1124
As a “rule of thumb,” courts have also considered the so-called “four-fifths rule” suggested by the Equal Employment Opportunity Commission.
See Clady,
V
The postal inspectors also falter in attacking a specific employment practice or selection criterion. They direct their disparate impact claims to “the decision-making process” or “the process by which the [screening] Panel evaluated applications.” They stress that no female applicants were initially screened for interviews. According to the postal inspectors, the imbalance in interview selections is attributable to the overall screening process.
Plaintiffs generally cannot attack an overall decisionmaking process in the disparate impact context, but must instead identify the particular element or practice within the process that causes an adverse impact.
Wards Cove,
The overall interview screening process included several discrete elements. Each member on the screening panel independently evaluated every applicant, measuring the applicant’s supervisor evaluations and the substantive contents of the application. The application tested a candidate’s proficiency on eleven validated competencies required for the AIC position. The panel members then met to compare their evaluations and discuss the applicants before collectively agreeing on the most qualified candidates.
The postal inspectors do not argue that the various elements of the screening process cannot be isolated for analysis. We doubt that the overall screening process should be treated as one employment practice for purposes of disparate impact analysis. It is not necessary to decide the issue because, in either event, the postal inspec *1125 tors fail to demonstrate the requisite causal connection between any selection practice and the claimed gender disparity.
The postal inspectors do not demonstrate that the screening process caused exclusion of female applicants from the interview stage because of the applicants’ gender.
See Watson,
In this case, by contrast, the postal inspectors fail to demonstrate how the screening process excludes female applicants due to gender. The elements of the screening process are facially gender neutral. An applicant is measured by performance on the validated competencies in the application and the strength of supervisor evaluations. There is no evidence that women perform worse than men on the competencies or that women receive poorer supervisor evaluations. Unlike in
Griggs,
where it was shown that the lower scores of black candidates were a factor in employment decisions that caused fewer black employees to be promoted, the postal inspectors here fail to show that women are measured lower than men on the neutral criteria involved in the screening decision. There is no evidence demonstrating that the neutral practices or criteria in the screening process “operate as ‘built-in head-winds’ ” for female applicants.
Griggs,
VI
The postal inspectors fail to identify a specific employment practice that disproportionately excludes female applicants because of the applicants’ gender. The statistical evidence offered is of dubious reliance, and in any case, fails to show an actual disparity in the intermediate interview selection stage. The district court properly granted summary judgment in favor of the Service on the disparate impact claims.
AFFIRMED.
Notes
. The AIC vacancy in the Washington, D.C. office was eliminated as a result of restructuring, leaving four open positions.
. If an interview was given to one more female applicant, there would be a higher percentage of female interviewees than female applicants. This potential reversal of fortunes underscores the problem in working with a small sample size.
See Contreras,
. If we consider each interview screening process as a weighted, independent event and aggregate the results, the postal inspectors still fail to state a prima facie claim of discrimination. Under this lens, two-thirds (10) of the total interviewees (15) were selected from an initial applicant pool consisting of 38 applicants (6 women, 32 men). One-third (5) of the total interviewees (15) were selected from a second round applicant pool of 19 applicants (5 women, 14 men). Overall, women were still interviewed at 13.3 percent 0is), but women now make up 19.3 percent of the applicant pool. Eighteen percent (2/n) of women in the applicant pool were chosen for interviews, whereas men were chosen at a rate of 28 percent ('^ó). The selection rate for women is now 64 percent (I8/6s) that of men, and no longer within the 80 percent haven established by the EEOC Guidelines. Yet the apparent violation of the 80 percent rule causes little concern. A swing of one woman interviewed changes the female to male selection rate from 64 percent to 104.6 percent, and liability cannot turn on such statistical caprice.
