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Always With You
The convenience of biometrics is obvious to anyone who accesses a secure computer or network on a regular basis. The ability to replace existing password based systems with a biometric (fingerprint for example) would allow for a more secure computing environment, while also reducing the very real and documented cost associated with maintaining a password system. Always having your password with you and never forgetting it is a convenience we can all benefit from.
The ease of use of a biometric systems depends heavily on the type of biometric used. For example, an iris recognition system would require a learning curve before the end user would become proficient at it. It may never get to the point that it feels "Easy". Fingerprint systems on the other hand require very little training and users typically only need to use the devices a few times before becoming proficient. This results in a pleasant experience that in short order becomes easier and more efficient than a password based system.