The book "Parallel, Object-Oriented, and Active Knowledge Base Systems" offers a comprehensive analysis and discussion on the integration of conventional database systems with artificial intelligence techniques. It highlights the necessity of capturing, storing, and continuously improving knowledge as a valuable resource to meet the growing demands of knowledge-based applications. The authors, Ioannis Vlahavas and Nick Bassiliades, present detailed features that an effective knowledge base system should possess to tackle the challenges of modern data processing. The book addresses various aspects, including the integration of deductive, productive, and active rules into sequential database systems, as well as the interoperability of multiple rule types within a single system. It is an essential work for professionals and students involved in the development and application of knowledge base systems.