ITIL
ITIL is a collection of best practice processes (generally published as text within books)
IT Service Management
IT Service Management is the combination of a repository and a set of management tools that support ITIL-like processes.
IT Service Management automates ITIL processes, especially by sharing informaction across tasks, roles, and tools, by using a Change and Configuration Management Database
SOA
(Service-Oriented Architecture)
SOA is very different still. It's an instance of an Application Architecture. An Application Architecture's role is to specify how different components comprising an application are able to communicate, both synchronously and asynchronously.
Who Can Benefit?
Certainly the Enterprise but SMBs, and even SOHOs, can benefit from Technology Architecture, ITIL, IT Service Management, and SOA
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