Thanks as always to my wife and children.

Thanks also the team at Pearson, Sam Jackson and Rachel Hayter in particular. A special thanks to Anne and Aileen at SortMyBooks for letting me use screenshots of their software.

Publisher’s acknowledgements

We are grateful to the following for permission to reproduce copyright material:

FiguresFigure 2.12, 2.14, 2.15, 2.16, 2.17, 2.18 from SortMyBooks,

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