HAZOP: Guide to Best Practice, Fourth Edition is an essential resource for professionals in the process industries, offering a comprehensive overview of the HAZOP study method. This updated edition incorporates the latest insights and practices to enhance safety and operational efficiency within HAZOP teams. Readers will discover how to effectively implement HAZOP techniques in both new and existing facilities, with clear guidance through every stage of the study process. The book features diagrammatic representations of key concepts, making complex information accessible and easy to understand. Delving into the intricacies of HAZOP, the book covers a wide range of topics, including the detailed HAZOP study procedure, organizing and conducting studies, recording and auditing processes, and advanced aspects of HAZOP. It also addresses specific applications, such as transient operations and proprietary equipment, while providing valuable appendices that illustrate HAZOP studies for various operational scenarios. With new content on the implications of AI and advanced control systems, this edition is timely and relevant.