This book explains how system availability and software reliability relate to real-world telecommunications systems. Readers will gain knowledge of how to understand, model, predict, and manage system availability throughout the development cycle. The methods and concepts discussed are practical in nature, and the modeling and prediction techniques and tools are customer-focused, data-driven, and aligned with industry standards. This is a valuable resource for system/software architects, engineers, testers, and product managers working in software in the industrial, IT, telecommunications, aerospace, military, and medical fields.