This part of ISO/IEC 19784 specifies a biometric sensor interface for a Biometric Service Provider (BSP@ see ISO/IEC 19784-1). The interface supports a BSP wishing to provide the BioAPI Service Provider Interface (SPI) functions@ whilst removing device handling activity from the BSP. This part of ISO/IEC 19784 provides an interface that can be used by all types of biometric sensor@ including inter alia image streaming sensors (infrared@ face@ iris@ finger@ etc.)@ voice streaming sensors and digital tablets providing dynamic signature data. It is not in the scope of this part of ISO/IEC 19784 to define security and privacy requirements for capturing and transferring of biometric data across the Sensor Function Provider Interface (SFPI).