We would like to thank Margaret Riley at Focal Press for her totally calm approach to what seemed to us to be an impossible task in the time available. Without her support this series could never have appeared at all.
We would also like to thank all our students, past, present and future, who have not only been the ‘guinea pigs’ for this book but, perhaps more importantly, have taught us so much about how to explain a very complex process in a very simple way.
Christmas comes but once a year
when Santa came this year and
realized why we asked for a
secretary and some time
all he had to say was
HO! HO! HO!
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