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To clarify how the concepts within ITIL work together, CCTA produced a set of process models to describe the makeup of ITIL - a high-level process model for Service Support can be found at Appendix F. These process models have been used in practice and enhanced since first produced and now form the cornerstones of the ITIL core books. The process elements for management of services can be defined precisely. However, in practice, when analysing the processes in more detail, elements overlap. This situation illustrates the need for both consistency across the guidance, and advice on how to deal with management problems that may arise. The cause of these management problems may be the result of boundaries drawn that perhaps have more to do with the span of control than with logical grouping of related processes.
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