Written by the original authoring team for the ITIL 2011 manuals these Key Element Guides provides a handy reference to the content contained within the core ITIL Lifecycle publications. They discuss ITIL & its evolution & the need for the Service Lifecycle approach. The titles examine what is meant by best practice framework how this relates to 'common practice' & about degrees of prescription & what compliance means. The main focus of each the Key Element Guides is to provide an overview of the principles objectives key elements roles & responsibilities challenges & key lessons for each of the five elements of the service lifecycle