Acknowledgments

I want to take this opportunity to give my sincere thanks to the many people who helped me and supported me through the sometimes painful process of making this book project a reality.

In the first place I want to thank my two main contributors and collaborators, Rafael Perez of SAP America and José Luis Herreros of CIBER Offilog in Spain, two extremely talented people who demonstrated not only their impressive technical knowledge but also their friendship and support. Rafael was the author of most part of Chapter 10 and also helped with several sections of Chapters 5 and 9. José Luis was the soul of Chapter 8 and contributed to some of the most complex topics in Chapter 4.

I want to thank my friend Patrick Osterhaus for his contribution ...

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