This part of ISO/IEC 17839 establishes — functional architecture of a Biometric System-on-Card — definition of type S1 (fully ISO/IEC 7810 compliant) and type S2 implementation of a Biometric System-on-Card — sensor types in a Biometric System-on-Card — minimum requirements to a Biometric System-on-Card with respect to — discriminative power (i.e. biometric accuracy criteria) — interfaces — power supply options The following aspects are out of scope of this International Standard: — off-card biometric comparison, storage-on-card — work-load sharing implementations — detailed specification and configuration of individual components This part of ISO/IEC 17839 provides a functional architectural description of a Biometric System-on-Card and describes how the interfaces are mapped using existing commands and data structures from other International Standards.