Dr. Michael Hammer and his co-author James Champy wrote the groundbreaking work Re-Engineering the Corporation. Dr. Hammer has long championed the concepts of using processes to accomplish work outputs and outcomes. Dr. Hammer spoke of three categories of work (or process output). Because a service can be defined as "work done for others," we can equate the types of work described by Hammer with the categories of services described by ITIL. The three categories of work according to Hammer are: · Value-Add (ITIL Core services) : This type of work (or services) provides direct value in the form of utility and warranty to the customers and users. Customers pay directly for this work or services. This work generates the revenue of your organization. This is "why you exist" and "what you do" as a business. · Non Value-Add (ITIL Enabling and Enhancing services) : This type of work supports, underpins and enables your Value-Add work or Core Servic