This guide presents a comprehensive framework for Agile Service Management, authored by Jayne Groll of the DevOps Institute. It addresses the urgent need for organizations to adapt their IT services to rapidly changing market conditions, particularly in the wake of disruptions like the COVID-19 pandemic. The guide outlines the importance of instilling Agile practices across all aspects of IT service management (ITSM) to enhance service delivery and customer value. It emphasizes that agility is not merely a goal but a necessity for business survival. The document details various chapters that cover fundamental concepts such as Agile principles, Scrum basics, and Agile process engineering. It also discusses the evolution of ITSM in relation to Agile and DevOps methodologies, highlighting the shift from traditional project management to a more iterative and flexible approach. The guide serves as a resource for organizations seeking to improve their ITSM practices through Agile methodologies.