-- how well the biometric separates individually from another and whether the biometric information offers a unique characteristic of a person (e.g. many individuals may have the same height and weight characteristics) ermanence -- measures how well a biometric resists aging collectability -- ease of acquisition for measurement erformance -- accuracy, speed, and robustness of technology used acceptability -- degree of approval of a technology circumvention -- ease of use of a substitute. Different biometric characteristics will vary in performance against the criteria outlined above. For example, some biometrics characteristics are more reliable than others, some are more widely used, and some are less intrusive than others. Some biometric characteristics cannot be as readily duplicated, lost or stolen as other biographical details. It is also important that agencies implement appropriate business processes around the storage and protection of biometric information. Biometric information itself, and the confidence in it, can be made vulnerable by weak storage and protection of the information on agencies' databases or by the carelessness of individuals. Agencies SHOULD consider the cost and lifetime of the supporting system (e.g. initial system set-up and ongoing licensing costs) when considering the requirements for the collection and storage of biometric information. The biometric information that the agency selects for use will influence the cost of the biometric system. 7.13 Trusted referees Trusted referees are a vital component of the EOI process. In particular, trusted referees can assist an agency with determining whether the presenting person links to the claimed identity. For