Thanks

A lot of people have supported the creation of this book. I have no way of mentioning them all. First, I would like to thank the members and the board of Datateknisk Forum and my managers, Mr. J rn Johansen and Mr. Ole Andersen, for believing in the idea and contributing to the contents.

I would also like to thank my colleagues ( especially Ms. Elisabeth Broe Christensen and Mr. Robert Olesen), Mr. Lars Bendix of the University of Lund, Sweden, and not least my husband, Finn, for providing many pieces of good advice and good ideas, and for the interest and patience they have shown during my work on the book. My husband's wry way of looking at things is sometimes annoying but always enlighteningthanks, Finn, for being who you are!

The publisher and my editor, Mr. Ross Venables, deserve lots of thanks for their enthusiasm and encouragement, all the way from my first approach through the development of the manuscript to the complete book.

Last but not least, a big thanks goes to my longtime friend Ms. Pernille Lemvig-Fog and my father, Mr. Birger Jonassen, for their great help with the translation of the text into understandable English.