We know that what works is what ﬁts
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
This book is a learning experience, as was the research that underpinned it. Those who study learning and education often refer to a stage in the learning process that is characterized by bewilderment and a feeling that what has been learnt so far has confused rather than informed. This stage, which we are all familiar with, follows the necessary deconstruction of old incorrect perceptions and precedes the construction of new and more useful understanding. We are at that stage of this book now. Hang in there; we are about to start creating new knowledge.