This article was originally published in 2015. With the Introduction of ITIL 4, some of this best practice has changed. See  ITIL 4 and the Evolving Role of Roles . Updated Definitions in ITIL 4: Process Owner: In ITIL 4, the concept of 'processes' has expanded into broader 'practices.' Consequently, the Process Owner is now often referred to as the 'Practice Owner.' This individual is accountable for the overall design, performance, integration, and improvement of a specific practice within the organization. They ensure that the practice achieves its intended outcomes and aligns with the organization's objectives. Process Manager: Now commonly known as the 'Practice Manager' in ITIL 4, this role is responsible for the day-to-day management of the practice. The Practice Manager ensures that activities are carried out as intended, manages resources assigned to the practice, and oversees the practitioners performing the work. Process Practit...