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An organization with extremely high security requirements is evaluating the effectiveness of
biometric systems. Which of the following performance indicators is MOST important?

False-acceptance rate (FAR)

Equal-error rate (EER)

False-rejection rate (FRR)

False-identification rate (FIR)

FAR is the frequency of accepting an unauthorized person as authorized, thereby granting access
when it should be denied, in an organization with high security requirements, user annoyance with
a higher FRR is less important, since it is better to deny access to an authorized individual than to
grant access to an unauthorized individual. EER is the point where the FAR equals the FRR;
therefore, it does not minimize the FAR. FIR is the probability that an authorized person is identified,
but is assigned a false ID.

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