Over the past ten years since the idea of adapting the evidence-based paradigm was first proposed for software engineering, it has become a major tool of empirical software engineering, influencing primary studies, as well as motivating secondary studies. This book promulgates an understanding of empirical software engineering practices and knowledge, including how to use such knowledge effectively. It provides guidance upon how to conduct secondary studies in software engineering?replacing the existing 2004 and 2007 technical reports.