The success of product line engineering techniques in the last 15 years has popularized the use of software variability as a key modeling approach for describing the commonality and variability of systems at all stages of the software lifecycle. Software product lines enable a family of products to share a common core platform, while allowing for product specific functionality being built on top of the platform. Many companies have exploited the concept of software product lines to increase the resources that focus on highly differentiating functionality and thus improve their competitiveness with higher quality and reusable products and decreasing the time-to-market condition. Many books on product line engineering either introduce specific product line techniques or include brief summaries of industrial cases. From these sources, it is difficult to gain a comprehensive understanding of the various dimensions and aspects of software variability. Here the editors address this gap by providing a comprehensive reference on the notion of variability modeling in the context of software product line engineering, presenting an overview of the techniques proposed for variability modeling and giving a detailed perspective on software variability management. Their book is organized in four main parts, which guide the reader through the various aspects and dimensions of software variability. Part 1 which is mostly written by the editors themselves introduces the major topics related to software variability modeling, thus providing a multi-faceted view of both technological and management issues. Next, part 2 of the book comprises four separate chapters dedicated to research and commercial tools. Part 3 then continues with the most practical viewpoint of the book presenting three different industry cases on how variability is managed in real industry projects. Finally, part 4 concludes the book and encompasses six different chapters on emerging research topics in software variability like e.g. service-oriented or dynamic software product lines, or variability and aspect orientation.Each chapter briefly summarizes "What you will learn in this chapter", so both expert and novice readers can easily locate the topics dealt with. Overall, the book captures the current state of the art and best practices, and indicates important open research challenges as well as possible pitfalls. Thus it serves as a reference for researchers and practitioners in software variability management, allowing them to develop the next set of solutions, techniques and methods in this complicated and yet fascinating field of software engineering.

Rafael Capilla is a tenured assistant professor at the Rey Juan Carlos University of Madrid (Spain) where he heads the Software Architecture & Internet Technologies research group. Prior to that, he worked in the software industry as a software analyst and Unix and network system manager. His current research interest focuses on software architectures, product line engineering and software variability management, and Web service technologies.Jan Bosch is professor of software engineering and director of the software research center at Chalmers University Technology in Gothenburg, Sweden. Earlier, he worked as Vice President Engineering Process at Intuit Inc where he also lead Intuit's Open Innovation efforts and headed the central mobile technologies team. Before Intuit, he was head of the Software and Application Technologies Laboratory at Nokia Research Center, Finland. Before joining Nokia, he headed the software engineering research group at the University of Groningen, The Netherlands, where he holds a professorship in software engineering. Kyo Chul Kang is a professor at the Pohang University of Science and Technology (POSTECH) in Korea. Before joining POSTECH, he worked at the University of Michigan, at Bell Communications Research and AT&T Bell Laboratories, and at the Software Engineering Institute (SEI), Carnegie Mellon University. His current research areas include software reuse and product line engineering, requirements engineering, and computer-aided software engineering.