A research area handbook is a comprehensive resource that provides an overview of a specific field of research, including key concepts, theories, methods, and advancements in the field. These handbooks typically feature chapters written by experts in the field, offering in-depth analysis and commentary on various topics within the research area. The purpose of a research area handbook is to provide researchers, students, and professionals with a comprehensive and up-to-date overview of the current state of knowledge in a particular field, and to serve as a valuable reference tool for further study and research.