Acknowledgements

We would like to thank the following colleagues for their valuable comments: Jari Välimäki, Peter Leis, Curt Wong and Martin Öttl.

The authors appreciate the fast and smooth editing process provided by John Wiley & Sons Ltd and especially Susan Barclay, Sandra Grayson, Sarah Tilley, Sophia Travis and Mark Hammond.

We are grateful to our families for their patience during the late night and weekend editing sessions.

The authors welcome any comments and suggestions for improvements or changes that could be used to improve future editions of this book. The feedback is welcomed to the authors' email addresses - miikka.poikselka@nsn.com, harri.holma@nsn.com, jukka.hongisto@nsn.com, juha.kallio@nsn.com and antti.toskala@nsn.com.

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