In this book we explore how GenAI (including Agentic AI) impacts quality engineering-not just as a tool to amplify development and testing, but also as a source of new risks and responsibilities. We also explore how quality engineering impacts the use of GenAI (including Agentic AI), for example consciously considering whether an AI-based system is the right solution. We share what we've learned, what we're still learning, and what we believe is needed to use GenAI (including Agentic AI) both eff ectively and responsibly.