The Service Strategy Volume—this is the hub of the core; understanding and translating business into IT strategy; recognizing and responding to business catalysts; selecting the best practices based on industry, regulatory environment, firm size, etc.
The Service Design Volume—IT service and architecture design models to consider, including outsourcing, insourcing, co-sourcing, etc.
The Service Transition Volume—how to create a transition strategy from service design and put it into the live environment. Topics include change and release management, service models, and checklists for taking designs into production (analogous to a software development lifecycle but for IT services).
The Service Operation Volume—how to manage services in the live or production environment; day-to-day management issues; how to react to failures; how to develop and monitor metrics of quality; and how to manage the reactive elements and processes.
The Continual Service Improvement Volume—how to improve service once deployed.