The MIPI I3C bus interface specification used in connecting peripherals to application processors for mobile, IoT and automotive applications is an evolution of the I2C bus specification. It features backward compatibility with I2C while offering improved throughput as well as features like in-band interrupts, which allow for higher performance sensor interfacing. This presentation will begin with an introduction of the I3C standard protocol, including the similarities and differences with respect to the I2C standard. We will then discuss some of the issues and challenges that arise in testing the I3C interface and the recommended approaches. Users will learn how the UltraFLEX Protocol Aware capabilities can be used to successfully implement tests utilizing the I3C bus. Taking debug one step further, we will introduce users to the critical role that PortBridge can play in ensuring engineers can debug quickly and efficiently at the protocol level and significantly reduce time to market.