In the presentation slides of the business process, its all layers and boxes and arrows and things in feng shui-esque harmony.
Under the hood, things often look a little different.
Business process automation is hard because the real world is complex. Business processes are complex. Workflows are complex. And everything keeps changing all the time darn it!
Solving most problems is a combination of People, Process and Technology.
The word "technology" is last on that list for a reason.
(Thanks to Tim for the pointer to the animation.)