As stated by the authors, the goal of this book is to present a comprehensive and unifying account of understanding the effect of complex connectivity patterns on dynamical phenomena in networks such as large-scale fluctuations and heterogeneities. For this purpose, there are examples from various disciplines to attract diverse audiences from physics and statistical mechanics, mathematical biology, and information science. These include examples from ecosystems, power grids, and the internet. However, in one of the chapters, there are also discussions about and examples from social sciences. The book is organized in modular approach and is devoid of complicated math, giving an easier access to new to- the-topic JASSS readers.