This book presents a combination of technical and administrative instructions for the development of attribute-based access control (ABAC) to improve information sharing within organizations. It focuses in particularly on the planning, design, implementation and operation, and explains in depth the history and model of ABAC, its relationship with other access control models. The book includes chapters on related standards, verification and assurance and deployment frameworks such as XACML. Researchers and implementers of these systems will also find an overview of Next Generation Access Model (NGAC), ABAC applications in SOA/workflow domains, ABAC architectures and details on feature sets in commercial and open source products.