Ami Nahari 
Secrets of Service Level Management: A process owner’s guide [PDF ebook] 
A process owner’s guide

An ITIL process guide that describes how to plan for, design, transition, operate and improve service level management. With a practical focus and real-life examples, this book turns the theory of SLM into practice.Key features:Illustrates how service level management interacts with the ITIL service lifecycle, and the lifecycle of service level management itself Includes real-life examples and experience for service level management experts Contains step-by-step guidance to enable practitioners to design and implement elements that support service level management Written in an engaging style