It is the nature of machines to break. Data communications have an infinite number of ways to fail. All mistakes are repeatable. The highest standard that a move can ever achieve is to be unremarkable. Every interface or separate responsibility multiplies the effort spent in politics and communication.
Nobody ever listens.
These may look cynical, but you can bet on most of the Bad Thirteen happening. The point of this book is to warn you what could happen, and to show you some practical ways of avoiding the larger pitfalls. Remember that God is in the details, and check everything. Reasons to be cheerful - or, why projects fail. In surveys of a large number of projects of all sizes, there were six main things that had to be done right for the project to succeed.