The Biometrics Glossary

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Threshold
The acceptance or rejection of biometric data is dependent on the match score falling above or below the threshold. The threshold is adjustable so that the biometric system can be more or less strict, depending on the requirements of any given biometric application.

Type I Error
The failure of a fingerprint identification system when it does not match a candidate fingerprint pattern with its mating fingerprint pattern (in other words, a failure to make a match that should have been made).

Type II Error 
The failure of a fingerprint identification system when it matches a candidate fingerprint pattern with a non-mating fingerprint pattern (in other words, making a match that should not have been made).