The book will explore, using multiple perspectives from multiple contributors, two main aspects for circular economy (CE) business and technology (B&T): systems and value perspectives. Going beyond a linear-economic perspective--the traditional perspective--CE needs to develop intentional and integrated paths to help restore physical resources and regenerate the functions of natural and anthropic systems, creating greater economic and social opportunities, with environmentally positive outcomes. Whether this is feasible and possible within the context of CE and B&T is something that will be central to the contributions made in this book. A major objective of the book is to deliver practical and fundamental knowledge of B&T CE insights combining a systems perspective and value creation for socio-technical innovation leading to sustainable transitions and effective transformations. Based on those key aspects, the book is structured in two parts, one from a more theoretical and conceptual basis in Part 1, and a more applied perspective in Part 2. The chapters in Part 1 are presented through the lens of business and systems transitions. In Part 2, the chapters present the opportunities and the journeys from real case studies of companies engaged in circular business strategies, processes, practices, and technologies.