In one way, the philosophy of this the last chapter in the third edition of Corrosion Science and Technology, departs slightly from the original concept of the first edition, but in a second way it remains true to the original vision. That edition was created in the late 1990s to be the template of a course at U.S. masters’ level, but also to double as a reference text. As such, the content is instructive covering the aspects of corrosion from the best current knowledge. Prediction of corrosion failures is different because premature failure – which is what prediction methods of corrosion failures are trying to avoid – is often a result of deficiencies in the knowledge of the materials system or its application in service or its environment. In this way this chapter is at least in part addressing faulty application of the principles outlined in the chapters of this and other similar texts on corrosion control.