Enterprise systems required service management to ensure that things run in a predictable and known way.  ITIL is generally the standard used for that.  Again, large organisations also accept that rigorous project management is the key to delivering projects to known budgets and timelines.  Agile development methods are proving to be better at providing quality in software development.

At one client, I had the challenge of explaining how these will all work together.  Here is the sketch I used: