Organizational policies, practices and procedures tells us how should we do it in our organization. Applied Framework tells us how should we do it in a particular context, like in IT. Best practices tells how should we do it. Standards tells us that what should be done.
HP ITSM and Microsoft Operating Framework(MOF) and Cobit are the examples of applied framework. ITIL is an example of best practices.
Models are like tools: not the goal, just the means to achieve the goals(goals of IT towards business). If you needed to implement IT control, CobiT is the answer; if you were working on operational IT processes/services, ITIL is the answer. Unfortunately, things are not that simple. With Cobit 4 and ITIL 3, n number of things are overlapping. ITIL going in the arena of Cobit and vice versa.
ITIL Alternative:
COBIT is perceived as an audit framework but the supporting body of knowledge (such as COBIT's books Control Practices, IT Assurance Guide, IT Governance Implementation Guide, and User's Guide for Service Managers) has grown to offer a credible alternative to ITIL.
Organizations that need to understand how ITIL processes link to a broader range of IT processes or need task level detail to guide their service management implementation can use the IBM Tivoli Unified Process (ITUP). Like MOF, ITUP is aligned with ITIL, but is presented as a complete, integrated process model.
ITIL Certification:
ITIL v2 offers 3 certification levels: Foundation, Practitioner and Manager. These should be progressively discontinued in favor of the new ITIL v3 scheme.
ITIL v3 certification levels are: Foundation, Intermediate, Expert and Master.
Link:
http://en.wikipedia.org/wiki/Information_Technology_Infrastructure_Library
http://www.computerworlduk.com/community/blogs/index.cfm?blogid=30&entryid=2249
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