Which part of ITIL provides guidance in adapting good practice for specific business environments and organizational strategies?

The ITIL Complementary Guidance extends the five core ITIL volumes by providing targeted, sector-specific advice that helps organizations tailor ITIL adoption to their unique business environments and strategic goals. It addresses gaps not covered by the core publications, offering guidance for verticals such as retail, finance, and public sector. This flexibility is what distinguishes it from the prescriptive core volumes.

The Service Support book is a legacy ITIL v2 publication covering operational processes such as incident and problem management, not guidance on adapting ITIL to specific business strategies.

Pocket Guides are condensed quick-reference summaries of ITIL concepts and do not provide strategic or contextual adaptation guidance.

The Service Strategy book covers how to align IT services with business objectives and governance, but it does not serve as the vehicle for adapting ITIL to specific organizational environments.