Page 291 - ITIL® Foundation 3.15

The general aim is to decide the most appropriate release unit level for each service asset or component. An organization may, for example, decide that the release unit for business critical applications is the complete
application in order to ensure that testing is comprehensive. The same organization may decide that a more appropriate release unit for a website is at the page level.
Release Unit - A collection of components that are normally released together as stated by an IT
organization’s release policy. A release unit is what is normally released together.
Release Package – One or more release units. A release package is what was actually released.
The factors for deciding the appropriate level for release units are:
• The ease and amount of change necessary to release and deploy a
release unit
• The resources and time needed to build, test, distribute and implement a
release unit
• The interface complexity between the proposed unit and the rest of the
IT infrastructure
• The Storage available in the build, test, distribution and live
environments
• Releases should be uniquely identified according to the release policy
• The release identification should include a reference to the CIs that it
represents and a version number that will often have two or three parts - Emergency fix releases: Payroll_System v.1.1.1, v.1.1.2, v.1.1.3.
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