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Most corporate IT environments have significant complexity. Even if the set of systems and applications are small in number, their interconnections, customisations, and dependencies quickly evolve into a morass of complexity referred to as the "IT rat's nest". Into this environment of IT complexity, the business continues to impose their requirements and changes, resulting in the creation of yet more IT resources, interconnections, customisations, and dependencies. This web of complexity quickly becomes so thick that any change to one part of the environment, say a data schema changes, has ripple effects throughout the whole of the organisation. Like a game of pick-up-sticks, nothing can move without moving the whole pile.
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