While writing this book, we were very fortunate to have the reviews, help and support of many people. For this version we especially mention Wil Gooskens, Merle Laterveer and Tim van Leeuwen, Breda University of Applied Sciences; and Ron van Haasteren and Renske van der Heide, Topdesk.
We would also like to thank Katinka Pani-Harreman, Sanjay Nair and Shriram Bharathwaj for their helpful comments during the review process.
So now, all that’s left is for us to offer a few definitions and a few ideas about getting started on a USD.