It is not easy to thank all those who have participated in and contributed to the research mentioned in this book.

I want to thank my scientific mentors Professor Benoît Iung and Professor Didier Theilliol, who have guided and supported my activity during all these years we have worked together. Special thanks to Christophe Simon, my co-author, my scientific partner and friend for all our joint contributions.

I thank my industry partners, Carole Duval (EDF), Paul Munteanu and Lionel Jouffe (Bayesia) for their trust and the various joint projects.

I cannot conclude the acknowledgments without extending my warmest thanks to my family, especially my wife Carole, who preserved the equilibrium in my life, and to my children Loïc and Manon, who have filled my family life with happiness.