This book deals with performance and dependability modeling and evaluation of computing systems. Some specific methodologies, techniques and tools for the quantitative assessment of such systems are investigated, also adopting a practical approach through examples. In this way the book aims at becoming a reference for practitioners, providing them guidelines on how to apply the techniques proposed to real case studies. The target audience are therefore engineers, modelers, system administrators, researchers and, generally, whoever wants and has the necessity of assessing performance and dependability of computing systems. Most of the work, the techniques and the tools discussed in the book are currently under development. In order to have clarifications, updates and upgrades on them you can directly contact the author.