Evolution of software has long been known as one of the most problematic and challenging in the field of software engineering, as evidenced by the high, often up to 60-80%, life-cycle costs associated with this activity during the life of a software system . This book provides a to-date scientific understanding of what evolution-up software, to show why it was inevitable for real world applications, and it demonstrates the role of feedback in software development and maintenance. Software Evolution and Feedback provides, long a focus of scientific maturity of software evolution and the role of feedback in the software process, make this guide indispensable for all software practitioners, researchers and managers in the software industry.