False Reject Rate

In any technological system, a certain amount of error is to be expected. False reject rate (FRR), then, measures the frequency with which users who should be granted access to an asset within your space are falsely denied permission because the user was not recognized. This is hugely important to your space because it helps you understand how often your system is wrongly refusing access to your protected amenities. If the FRR is relatively low, you shouldn’t worry about deeper issues within your access control system. If you’re experiencing a relatively high FRR, your system administrators should consider how to remedy the issue. If an elevator reader is wrongly denying cardholder access to certain floors, for example, business activities might be interrupted, keeping your space from being as productive as it could be. The FRR is a great measure of your facility's overall system health, helping you monitor how effective your security system is at allowing access to the correct cardholders and denying access to the ones who shouldn’t be allowed in.

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Kisi Physical Security Guide