For example, a key element of ITIL is the configuration management database (CMDB) designed to control changes to configuration. The CMDB defines the relationships between configurations to minimize the risk to a business when it plans and implements change. This is an excellent practice, but it won't succeed if the CMDB itself is fragmented and not adequately maintained.
Maintaining a CMDB is impossible without a view of IT enterprise management that touches every IT process. Without this view, the unified database quickly degenerates to a collection of unconnected spreadsheets used by isolated departments. These islands of data don't reflect the true state of the infrastructure and result in a mad scramble to collect data when an audit is imminent.